diff --git a/Pipfile.lock b/Pipfile.lock
index 58b22de..ae3b73e 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,20 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "ef6576a3cfdad0ed1ca50b745ab3c3295310048b205fa9b34fb9517af12af3da"
-        },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.7.0",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "4.13.0-46-generic",
-            "platform_system": "Linux",
-            "platform_version": "#51-Ubuntu SMP Tue Jun 12 12:36:29 UTC 2018",
-            "python_full_version": "3.7.0",
-            "python_version": "3.7",
-            "sys_platform": "linux"
+            "sha256": "ee2f047f418d118ed7f9f7f677e374bc437f4add8c9e7fc588e8a516f877f7a5"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -34,85 +21,227 @@
             "path": "./"
         },
         "apipkg": {
-            "hashes": [],
+            "hashes": [
+                "sha256:37228cda29411948b422fae072f57e31d3396d2ee1c9783775980ee9c9990af6",
+                "sha256:58587dd4dc3daefad0487f6d9ae32b4542b185e1c36db6993290e7c41ca2b47c"
+            ],
             "version": "==1.5"
         },
         "appdirs": {
-            "hashes": [],
-            "version": "==1.4.3"
+            "hashes": [
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
+            ],
+            "version": "==1.4.4"
         },
         "atomicwrites": {
-            "hashes": [],
-            "version": "==1.1.5"
+            "hashes": [
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
+            ],
+            "version": "==1.4.0"
         },
         "attrs": {
-            "hashes": [],
-            "version": "==18.1.0"
+            "hashes": [
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+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
+            ],
+            "version": "==20.3.0"
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         "black": {
-            "hashes": [],
+            "hashes": [
+                "sha256:22158b89c1a6b4eb333a1e65e791a3f8b998cf3b11ae094adb2570f31f769a44",
+                "sha256:4b475bbd528acce094c503a3d2dbc2d05a4075f6d0ef7d9e7514518e14cc5191"
+            ],
+            "index": "pypi",
             "version": "==18.6b4"
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         "click": {
-            "hashes": [],
+            "hashes": [
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+                "sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b"
+            ],
+            "index": "pypi",
             "version": "==6.7"
         },
         "coverage": {
-            "hashes": [],
+            "hashes": [
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+                "sha256:f05a636b4564104120111800021a92e43397bc12a5c72fed7036be8556e0029e",
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             "version": "==4.5.1"
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         "enum34": {
-            "hashes": [],
-            "version": "==1.1.6"
+            "hashes": [
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+                "sha256:c3858660960c984d6ab0ebad691265180da2b43f07e061c0f8dca9ef3cffd328",
+                "sha256:cce6a7477ed816bd2542d03d53db9f0db935dd013b70f336a95c73979289f248"
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+            "version": "==1.1.10"
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         "execnet": {
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-            "version": "==1.5.0"
-        },
-        "funcsigs": {
-            "hashes": [],
-            "markers": "python_version < '3.0'",
-            "version": "==1.0.2"
+            "hashes": [
+                "sha256:7a13113028b1e1cc4c6492b28098b3c6576c9dccc7973bfe47b342afadafb2ac",
+                "sha256:b73c5565e517f24b62dea8a5ceac178c661c4309d3aa0c3e420856c072c411b4"
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+            "version": "==1.8.0"
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         "futures": {
-            "hashes": [],
+            "hashes": [
+                "sha256:3a44f286998ae64f0cc083682fcfec16c406134a81a589a5de445d7bb7c2751b",
+                "sha256:51ecb45f0add83c806c68e4b06106f90db260585b25ef2abfcda0bd95c0132fd",
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             "version": "==3.1.1"
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         "grpcio": {
-            "hashes": [],
+            "hashes": [
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+                "sha256:435b3bab2e34814666854eec203c77b169df1cd56cf22fe449cf5510af416e7d",
+                "sha256:4765600467d7cdb8f62a591d4427ddbeefcf4dbbe46e2f1b10af555e815ecbcb",
+                "sha256:4fa658a7e1ba5727ca066b1c8bb64c6befb98f2b8007f04a16c7c84555bf11b9",
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+                "sha256:88afda198adb0a9da52a66152062027a57877b46f59ffcf55acc3cbfaff77160",
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+                "sha256:a1bc37c9910d0fbf4d9e80d5822f92c6e01e28dd1eb01323636ed19666b537cb",
+                "sha256:aa473b8276de39eeccc4ad6cbb7fd7feab0868180d72c0c93226033c79fa69b7",
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+                "sha256:b56e4f355c2499bb0bf8f8f4d0362b618b06afdfd2c10722710596dc7e295c6c",
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+                "sha256:d9e3105f6de6cb759b028702bdd21cb36d27e010227669e43c675b9957a3c180",
+                "sha256:da306c80d69801a3e4115c448ed4ad481957d723ec1e00b99497c6661573c3e5",
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+                "sha256:e86639989c03831912fd9924beda26f6e9ffcc267656cea035bde9d88cf793b2",
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+        "importlib-metadata": {
+            "hashes": [
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+            "version": "==5.8.0"
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         "more-itertools": {
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-            "version": "==4.3.0"
+            "hashes": [
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         "mypy": {
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+            "hashes": [
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+                "sha256:c770605a579fdd4a014e9f0a34b6c7a36ce69b08100ff728e96e27445cef3b3c"
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             "version": "==0.620"
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-            "markers": "python_version < '3.6'",
-            "version": "==2.3.2"
-        },
         "pep8": {
-            "hashes": [],
+            "hashes": [
+                "sha256:b22cfae5db09833bb9bd7c8463b53e1a9c9b39f12e304a8d0bba729c501827ee",
+                "sha256:fe249b52e20498e59e0b5c5256aa52ee99fc295b26ec9eaa85776ffdb9fe6374"
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             "version": "==1.7.1"
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         "pluggy": {
-            "hashes": [],
-            "version": "==0.7.1"
+            "hashes": [
+                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
+                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
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+            "version": "==0.13.1"
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         "protobuf": {
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-            "version": "==3.6.0"
+            "hashes": [
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+                "sha256:07eec4e2ccbc74e95bb9b3afe7da67957947ee95bdac2b2e91b038b832dd71f0",
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+                "sha256:4a054b0b5900b7ea7014099e783fb8c4618e4209fffcd6050857517b3f156e18",
+                "sha256:510e66491f1a5ac5953c908aa8300ec47f793130097e4557482803b187a8ee05",
+                "sha256:5ff9fa0e67fcab442af9bc8d4ec3f82cb2ff3be0af62dba047ed4187f0088b7d",
+                "sha256:90270fe5732c1f1ff664a3bd7123a16456d69b4e66a09a139a00443a32f210b8",
+                "sha256:a0a08c6b2e6d6c74a6eb5bf6184968eefb1569279e78714e239d33126e753403",
+                "sha256:c5566f956a26cda3abdfacc0ca2e21db6c9f3d18f47d8d4751f2209d6c1a5297",
+                "sha256:dab75b56a12b1ceb3e40808b5bd9dfdaef3a1330251956e6744e5b6ed8f8830b",
+                "sha256:efa4c4d4fc9ba734e5e85eaced70e1b63fb3c8d08482d839eb838566346f1737",
+                "sha256:f17b352d7ce33c81773cf81d536ca70849de6f73c96413f17309f4b43ae7040b",
+                "sha256:f42c2f5fb67da5905bfc03733a311f72fa309252bcd77c32d1462a1ad519521e",
+                "sha256:f6077db37bfa16494dca58a4a02bfdacd87662247ad6bc1f7f8d13ff3f0013e1",
+                "sha256:f80afc0a0ba13339bbab25ca0409e9e2836b12bb012364c06e97c2df250c3343",
+                "sha256:f9cadaaa4065d5dd4d15245c3b68b967b3652a3108e77f292b58b8c35114b56c",
+                "sha256:fad4f971ec38d8df7f4b632c819bf9bbf4f57cfd7312cf526c69ce17ef32436a"
+            ],
+            "version": "==3.15.8"
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         "py": {
-            "hashes": [],
-            "version": "==1.5.4"
+            "hashes": [
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
+            ],
+            "index": "pypi",
+            "version": "==1.10.0"
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         "pydgraph": {
-            "hashes": [],
+            "hashes": [
+                "sha256:5816f913721e9edfd7b0bf47c9496f70adfc4ccf870d6d4badf5fb49b3997067",
+                "sha256:642234d2f949c0784f0860e8f2684c38a2a75c7bab51c0ad64a9f40a53ea6156"
+            ],
+            "index": "pypi",
             "version": "==1.0.0"
         },
         "pydiggy": {
@@ -120,49 +249,104 @@
             "path": "."
         },
         "pyflakes": {
-            "hashes": [],
-            "version": "==2.0.0"
+            "hashes": [
+                "sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3",
+                "sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db"
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         "pytest": {
-            "hashes": [],
+            "hashes": [
+                "sha256:86a8dbf407e437351cef4dba46736e9c5a6e3c3ac71b2e942209748e76ff2086",
+                "sha256:e74466e97ac14582a8188ff4c53e6cc3810315f342f6096899332ae864c1d432"
+            ],
+            "index": "pypi",
             "version": "==3.7.1"
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         "pytest-cache": {
-            "hashes": [],
+            "hashes": [
+                "sha256:be7468edd4d3d83f1e844959fd6e3fd28e77a481440a7118d430130ea31b07a9"
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         "pytest-cov": {
-            "hashes": [],
+            "hashes": [
+                "sha256:03aa752cf11db41d281ea1d807d954c4eda35cfa1b21d6971966cc041bbf6e2d",
+                "sha256:890fe5565400902b0c78b5357004aab1c814115894f4f21370e2433256a3eeec"
+            ],
+            "index": "pypi",
             "version": "==2.5.1"
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         "pytest-flakes": {
-            "hashes": [],
+            "hashes": [
+                "sha256:341964bf5760ebbdde9619f68a17d5632c674c3f6903ef66daa0a4f540b3d143",
+                "sha256:daaf319250eeefa8cb13b0ba78ffdda67926c4b6446a9e14f946b86d1ba6af23"
+            ],
+            "index": "pypi",
             "version": "==4.0.0"
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         "pytest-pep8": {
-            "hashes": [],
+            "hashes": [
+                "sha256:032ef7e5fa3ac30f4458c73e05bb67b0f036a8a5cb418a534b3170f89f120318"
+            ],
+            "index": "pypi",
             "version": "==1.0.6"
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-        "scandir": {
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-            "markers": "python_version < '3.5'",
-            "version": "==1.8"
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         "six": {
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