chore(package): update mocha to version 7.1.2

Closes #2

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
   "license": "MIT",
   "devDependencies": {
     "jshint": "^2.5.5",
-    "mocha": "^3.3.0"
+    "mocha": "^7.1.2"
   },
   "dependencies": {}
 }