chore(package): update mocha to version 6.0.1

Closes #35

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "husky": "^0.15.0-rc.8",
     "inchjs": "git://github.com/cgalvarez/inchjs#fix/printing-chunks",
     "jsonlint": "^1.6.3",
-    "mocha": "^5.0.0",
+    "mocha": "^6.0.1",
     "mochawesome": "^3.0.2",
     "mock-fs": "^4.5.0",
     "npm-run-all": "^4.1.2",