diff --git a/package-lock.json b/package-lock.json
index d6a73fa..43bdee8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,7 +43,8 @@
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       "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.0.tgz",
-      "integrity": "sha512-sY5AXXVZv4Y1VACTtR11UJCPHHudgY5i26Qj5TypE6DKlIApbwb5uqhXcJ5UUGbvZNRh7EeIoW+LrJumBsKp7w=="
+      "integrity": "sha512-sY5AXXVZv4Y1VACTtR11UJCPHHudgY5i26Qj5TypE6DKlIApbwb5uqhXcJ5UUGbvZNRh7EeIoW+LrJumBsKp7w==",
+      "dev": true
     },
     "accepts": {
       "version": "1.3.5",
@@ -57,12 +58,14 @@
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       "version": "6.0.4",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.4.tgz",
-      "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg=="
+      "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==",
+      "dev": true
     },
     "acorn-globals": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.3.0.tgz",
       "integrity": "sha512-hMtHj3s5RnuhvHPowpBYvJVj3rAar82JiDQHvGs1zO0l10ocX/xEdBShNHTJaboucJUsScghp74pH3s7EnHHQw==",
+      "dev": true,
       "requires": {
         "acorn": "^6.0.1",
         "acorn-walk": "^6.0.1"
@@ -71,7 +74,8 @@
         "acorn": {
           "version": "6.0.4",
           "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.4.tgz",
-          "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg=="
+          "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==",
+          "dev": true
         }
       }
     },
@@ -84,7 +88,8 @@
     "acorn-walk": {
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       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.0.tgz",
-      "integrity": "sha512-ugTb7Lq7u4GfWSqqpwE0bGyoBZNMTok/zDBXxfEG0QM50jNlGhIWjRC1pPN7bvV1anhF+bs+/gNcRw+o55Evbg=="
+      "integrity": "sha512-ugTb7Lq7u4GfWSqqpwE0bGyoBZNMTok/zDBXxfEG0QM50jNlGhIWjRC1pPN7bvV1anhF+bs+/gNcRw+o55Evbg==",
+      "dev": true
     },
     "ajv": {
       "version": "5.5.2",
@@ -167,7 +172,8 @@
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       "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
-      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM="
+      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
+      "dev": true
     },
     "array-flatten": {
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@@ -233,7 +239,8 @@
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       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
-      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
+      "dev": true
     },
     "asynckit": {
       "version": "0.4.0",
@@ -611,7 +618,7 @@
       "dependencies": {
         "http-errors": {
           "version": "1.6.3",
-          "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+          "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
           "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
           "requires": {
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@@ -662,7 +669,8 @@
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       "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-0.1.3.tgz",
-      "integrity": "sha512-bRFnI4NnjO6cnyLmOV/7PVoDEMJChlcfN0z4s1YMBY989/SvlfMI1lgCnkFUs53e9gQF+w7qu7XdllSTiSl8Aw=="
+      "integrity": "sha512-bRFnI4NnjO6cnyLmOV/7PVoDEMJChlcfN0z4s1YMBY989/SvlfMI1lgCnkFUs53e9gQF+w7qu7XdllSTiSl8Aw==",
+      "dev": true
     },
     "browser-resolve": {
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@@ -1070,12 +1078,14 @@
     "cssom": {
       "version": "0.3.4",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.4.tgz",
-      "integrity": "sha512-+7prCSORpXNeR4/fUP3rL+TzqtiFfhMvTd7uEqMdgPvLPt4+uzFUeufx5RHjGTACCargg/DiEt/moMQmvnfkog=="
+      "integrity": "sha512-+7prCSORpXNeR4/fUP3rL+TzqtiFfhMvTd7uEqMdgPvLPt4+uzFUeufx5RHjGTACCargg/DiEt/moMQmvnfkog==",
+      "dev": true
     },
     "cssstyle": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-1.1.1.tgz",
       "integrity": "sha512-364AI1l/M5TYcFH83JnOH/pSqgaNnKmYgKrm0didZMGKWjQB60dymwWy1rKUgL3J1ffdq9xVi2yGLHdSjjSNog==",
+      "dev": true,
       "requires": {
         "cssom": "0.3.x"
       }
@@ -1092,6 +1102,7 @@
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       "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-1.1.0.tgz",
       "integrity": "sha512-YTWYI9se1P55u58gL5GkQHW4P6VJBJ5iBT+B5a7i2Tjadhv52paJG0qHX4A0OR6/t52odI64KP2YvFpkDOi3eQ==",
+      "dev": true,
       "requires": {
         "abab": "^2.0.0",
         "whatwg-mimetype": "^2.2.0",
@@ -1111,6 +1122,11 @@
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
     },
+    "decimal.js": {
+      "version": "10.3.1",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.3.1.tgz",
+      "integrity": "sha512-V0pfhfr8suzyPGOx3nmq4aHqabehUZn6Ch9kyFpV79TGDTWFmHqUqXdabR7QHqxzrYolF4+tVmJhUG4OURg5dQ=="
+    },
     "decode-uri-component": {
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       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
@@ -1274,6 +1290,7 @@
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       "resolved": "https://registry.npmjs.org/domexception/-/domexception-1.0.1.tgz",
       "integrity": "sha512-raigMkn7CJNNo6Ihro1fzG7wr3fHuYVytzquZKX5n0yizGsTcYgzdIUwj1X9pK0VvjeihV+XiclP+DjwbsSKug==",
+      "dev": true,
       "requires": {
         "webidl-conversions": "^4.0.2"
       }
@@ -1396,6 +1413,7 @@
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       "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.11.0.tgz",
       "integrity": "sha512-IeMV45ReixHS53K/OmfKAIztN/igDHzTJUhZM3k1jMhIZWjk45SMwAtBsEXiJp3vSPmTcu6CXn7mDvFHRN66fw==",
+      "dev": true,
       "requires": {
         "esprima": "^3.1.3",
         "estraverse": "^4.2.0",
@@ -1408,6 +1426,7 @@
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
           "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true,
           "optional": true
         }
       }
@@ -1555,7 +1574,8 @@
     "esprima": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.1.3.tgz",
-      "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM="
+      "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM=",
+      "dev": true
     },
     "esquery": {
       "version": "1.0.1",
@@ -1578,7 +1598,8 @@
     "estraverse": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.2.0.tgz",
-      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM="
+      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM=",
+      "dev": true
     },
     "esutils": {
       "version": "2.0.2",
@@ -1975,7 +1996,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.1.1",
@@ -2018,7 +2040,8 @@
         },
         "balanced-match": {
           "version": "0.4.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "bcrypt-pbkdf": {
           "version": "1.0.1",
@@ -2031,6 +2054,7 @@
         "block-stream": {
           "version": "0.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "inherits": "~2.0.0"
           }
@@ -2038,6 +2062,7 @@
         "boom": {
           "version": "2.10.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "hoek": "2.x.x"
           }
@@ -2045,6 +2070,7 @@
         "brace-expansion": {
           "version": "1.1.7",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^0.4.1",
             "concat-map": "0.0.1"
@@ -2052,7 +2078,8 @@
         },
         "buffer-shims": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "caseless": {
           "version": "0.12.0",
@@ -2066,30 +2093,36 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "delayed-stream": "~1.0.0"
           }
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "boom": "2.x.x"
           }
@@ -2124,7 +2157,8 @@
         },
         "delayed-stream": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "delegates": {
           "version": "1.0.0",
@@ -2151,7 +2185,8 @@
         },
         "extsprintf": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "forever-agent": {
           "version": "0.6.1",
@@ -2170,11 +2205,13 @@
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "fstream": {
           "version": "1.0.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "graceful-fs": "^4.1.2",
             "inherits": "~2.0.0",
@@ -2225,6 +2262,7 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "^1.0.0",
             "inflight": "^1.0.4",
@@ -2236,7 +2274,8 @@
         },
         "graceful-fs": {
           "version": "4.1.11",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "har-schema": {
           "version": "1.0.5",
@@ -2260,6 +2299,7 @@
         "hawk": {
           "version": "3.1.3",
           "bundled": true,
+          "optional": true,
           "requires": {
             "boom": "2.x.x",
             "cryptiles": "2.x.x",
@@ -2269,7 +2309,8 @@
         },
         "hoek": {
           "version": "2.16.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "http-signature": {
           "version": "1.1.1",
@@ -2284,6 +2325,7 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "once": "^1.3.0",
             "wrappy": "1"
@@ -2291,7 +2333,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.4",
@@ -2301,6 +2344,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -2312,7 +2356,8 @@
         },
         "isarray": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "isstream": {
           "version": "0.1.2",
@@ -2375,11 +2420,13 @@
         },
         "mime-db": {
           "version": "1.27.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
+          "optional": true,
           "requires": {
             "mime-db": "~1.27.0"
           }
@@ -2387,17 +2434,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -2447,7 +2497,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -2462,6 +2513,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -2487,7 +2539,8 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "performance-now": {
           "version": "0.2.0",
@@ -2496,7 +2549,8 @@
         },
         "process-nextick-args": {
           "version": "1.0.7",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -2529,6 +2583,7 @@
         "readable-stream": {
           "version": "2.2.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "~1.0.0",
             "core-util-is": "~1.0.0",
@@ -2571,13 +2626,15 @@
         "rimraf": {
           "version": "2.6.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "glob": "^7.0.5"
           }
         },
         "safe-buffer": {
           "version": "5.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "semver": {
           "version": "5.3.0",
@@ -2597,6 +2654,7 @@
         "sntp": {
           "version": "1.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "hoek": "2.x.x"
           }
@@ -2627,6 +2685,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -2636,6 +2695,7 @@
         "string_decoder": {
           "version": "1.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.0.1"
           }
@@ -2648,6 +2708,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -2660,6 +2721,7 @@
         "tar": {
           "version": "2.2.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "block-stream": "*",
             "fstream": "^1.0.2",
@@ -2709,7 +2771,8 @@
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
@@ -2734,7 +2797,8 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
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@@ -3006,6 +3070,7 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-1.0.2.tgz",
       "integrity": "sha512-71lZziiDnsuabfdYiUeWdCVyKuqwWi23L8YeIgV9jSSZHCtb6wB1BKWooH7L3tn4/FuZJMVWyNaIDr4RGmaSYw==",
+      "dev": true,
       "requires": {
         "whatwg-encoding": "^1.0.1"
       }
@@ -3333,6 +3398,11 @@
       "resolved": "https://registry.npmjs.org/is-posix-bracket/-/is-posix-bracket-0.1.1.tgz",
       "integrity": "sha1-MzTceXdDaOkvAW5vvAqI9c1ua8Q="
     },
+    "is-potential-custom-element-name": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
+      "integrity": "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ=="
+    },
     "is-primitive": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-primitive/-/is-primitive-2.0.0.tgz",
@@ -3609,7 +3679,7 @@
         },
         "yargs": {
           "version": "11.1.0",
-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
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           "dev": true,
           "requires": {
@@ -3964,7 +4034,7 @@
         },
         "yargs": {
           "version": "11.1.0",
-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
           "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
           "dev": true,
           "requires": {
@@ -4157,51 +4227,326 @@
       }
     },
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-      "resolved": "https://registry.npmjs.org/parse5/-/parse5-5.1.0.tgz",
-      "integrity": "sha512-fxNG2sQjHvlVAYmzBZS9YlDp6PTSSDwa98vkD4QgVDDCAo84z5X1t5XyJQ62ImdLXx5NdIIfihey6xpum9/gRQ=="
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-6.0.1.tgz",
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@@ -5099,7 +5446,8 @@
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+      "dev": true
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     "posix-character-classes": {
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@@ -5285,7 +5633,7 @@
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-          "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+          "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
           "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
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@@ -5508,6 +5856,7 @@
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       "integrity": "sha1-Pu4AssWqgyOc+wTFcA2jb4HNCLY=",
+      "dev": true,
       "requires": {
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@@ -5516,6 +5865,7 @@
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       "resolved": "https://registry.npmjs.org/request-promise-native/-/request-promise-native-1.0.5.tgz",
       "integrity": "sha1-UoF3D2jgyXGeUWP9P6tIIhX0/aU=",
+      "dev": true,
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@@ -5894,7 +6244,8 @@
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-              "dev": true
+              "dev": true,
+              "optional": true
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@@ -5915,12 +6266,14 @@
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               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "brace-expansion": {
               "version": "1.1.11",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -5935,17 +6288,20 @@
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               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "concat-map": {
               "version": "0.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "console-control-strings": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "core-util-is": {
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@@ -6062,7 +6418,8 @@
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               "version": "2.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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@@ -6074,6 +6431,7 @@
               "version": "1.0.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
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               }
@@ -6088,6 +6446,7 @@
               "version": "3.0.4",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -6095,12 +6454,14 @@
             "minimist": {
               "version": "0.0.8",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "2.2.4",
               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -6119,6 +6480,7 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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               }
@@ -6199,7 +6561,8 @@
             "number-is-nan": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "4.1.1",
@@ -6211,6 +6574,7 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -6296,7 +6660,8 @@
             "safe-buffer": {
               "version": "5.1.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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@@ -6332,6 +6697,7 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -6351,6 +6717,7 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -6394,12 +6761,14 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "yallist": {
               "version": "3.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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@@ -6507,11 +6876,11 @@
       "dev": true
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-      "version": "3.1.4",
-      "resolved": "https://registry.npmjs.org/saxes/-/saxes-3.1.4.tgz",
-      "integrity": "sha512-GVZmLJnkS4Vl8Pe9o4nc5ALZ615VOVxCmea8Cs0l+8GZw3RQ5XGOSUomIUfuZuk4Todo44v4y+HY1EATkDDiZg==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-5.0.1.tgz",
+      "integrity": "sha512-5LBh1Tls8c9xgGjw3QrMwETmTMVk0oFgvrFSvWx62llR2hcEInrKNZ2GZCCuuy2lvWrdl5jhbpeqc5hRYKFOcw==",
       "requires": {
-        "xmlchars": "^1.3.1"
+        "xmlchars": "^2.2.0"
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@@ -7030,7 +7399,8 @@
     "symbol-tree": {
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       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.2.tgz",
-      "integrity": "sha1-rifbOPZgp64uHDt9G8KQgZuFGeY="
+      "integrity": "sha1-rifbOPZgp64uHDt9G8KQgZuFGeY=",
+      "dev": true
     },
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@@ -7192,6 +7562,7 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-1.0.1.tgz",
       "integrity": "sha1-qLE/1r/SSJUZZ0zN5VujaTtwbQk=",
+      "dev": true,
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       }
@@ -7373,7 +7744,6 @@
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-      "dev": true,
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@@ -7460,17 +7830,16 @@
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       "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
       "requires": {
         "browser-process-hrtime": "^0.1.2"
       }
     },
     "w3c-xmlserializer": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-1.0.1.tgz",
-      "integrity": "sha512-XZGI1OH/OLQr/NaJhhPmzhngwcAnZDLytsvXnRmlYeRkmbb0I7sqFFA22erq4WQR0sUu17ZSQOAV9mFwCqKRNg==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-2.0.0.tgz",
+      "integrity": "sha512-4tzD0mF8iSiMiNs30BiLO3EpfGLZUT2MSX/G+o7ZywDzliWQ3OPtTZ0PTC3B3ca1UAf4cJMHB+2Bf56EriJuRA==",
       "requires": {
-        "domexception": "^1.0.1",
-        "webidl-conversions": "^4.0.2",
         "xml-name-validator": "^3.0.0"
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@@ -7513,7 +7882,8 @@
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       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
-      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg=="
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
     },
     "whatwg-encoding": {
       "version": "1.0.5",
@@ -7536,12 +7906,14 @@
     "whatwg-mimetype": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.2.0.tgz",
-      "integrity": "sha512-5YSO1nMd5D1hY3WzAQV3PzZL83W3YeyR1yW9PcH26Weh1t+Vzh9B6XkDh7aXm83HBZ4nSMvkjvN2H2ySWIvBgw=="
+      "integrity": "sha512-5YSO1nMd5D1hY3WzAQV3PzZL83W3YeyR1yW9PcH26Weh1t+Vzh9B6XkDh7aXm83HBZ4nSMvkjvN2H2ySWIvBgw==",
+      "dev": true
     },
     "whatwg-url": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.0.0.tgz",
       "integrity": "sha512-37GeVSIJ3kn1JgKyjiYNmSLP1yzbpb29jdmwBSgkD9h40/hyrR/OifpVUndji3tmwGgD8qpw7iQu3RSbCrBpsQ==",
+      "dev": true,
       "requires": {
         "lodash.sortby": "^4.7.0",
         "tr46": "^1.0.1",
@@ -7613,12 +7985,9 @@
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-      "version": "6.1.2",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.2.tgz",
-      "integrity": "sha512-rfUqzvz0WxmSXtJpPMX2EeASXabOrSMk1ruMOV3JBTBjo4ac2lDjGGsbQSyxj8Odhw5fBib8ZKEjDNvgouNKYw==",
-      "requires": {
-        "async-limiter": "~1.0.0"
-      }
+      "version": "7.5.8",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.8.tgz",
+      "integrity": "sha512-ri1Id1WinAX5Jqn9HejiGb8crfRio0Qgu8+MtL36rlTA6RLsMdWt1Az/19A2Qij6uSHUMphEFaTKa4WG+UNHNw=="
     },
     "xml-name-validator": {
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@@ -7626,9 +7995,9 @@
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-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-1.3.1.tgz",
-      "integrity": "sha512-tGkGJkN8XqCod7OT+EvGYK5Z4SfDQGD30zAa58OcnAa0RRWgzUEK72tkXhsX1FZd+rgnhRxFtmO+ihkp8LHSkw=="
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="
     },
     "xmlcreate": {
       "version": "1.0.2",
diff --git a/package.json b/package.json
index b34b8df..dc0fd24 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
     "gzip-size": "^5.0.0",
     "inquirer": "^6.2.1",
     "jsdoc-x": "^4.0.3",
-    "jsdom": "^13.1.0",
+    "jsdom": "^16.5.0",
     "less": "^3.9.0",
     "less-plugin-clean-css": "^1.5.1",
     "lodash": "^4.17.11",