chore(package): update npm-check-updates to version 6.0.1

Closes #74

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "mkdirp": "^0.5.1",
     "mocha": "^6.1.3",
     "mocha-headless-chrome": "^2.0.2",
-    "npm-check-updates": "^3.1.7",
+    "npm-check-updates": "^6.0.1",
     "requirejs": "^2.3.6",
     "run-for-every-file": "^1.1.0",
     "shenanigans-manager": "^0.2.36",