chore(package): update mocha to version 7.1.2

Closes #3

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
     "bluebird": "^3.4.7",
     "chai": "^3.5.0",
     "coffee-script": "^1.12.2",
-    "mocha": "^3.2.x"
+    "mocha": "^7.1.2"
   },
   "optionalDependencies": {},
   "engines": {