chore(package): update mocha to version 6.2.1

Closes #3

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "iced-coffee-coverage": "^1.0.3",
     "iced-coffee-script": "^108.0.11",
     "istanbul": "^0.4.5",
-    "mocha": "^3.1.0",
+    "mocha": "^6.2.1",
     "redis": "^2.6.2"
   },
   "dependencies": {