chore(package): update mocha to version 4.0.1

Closes #31

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "eslint-plugin-react": "^7.0.0",
     "husky": "^0.13.0",
     "jsdoc": "^3.4.3",
-    "mocha": "^3.0.0",
+    "mocha": "^4.0.1",
     "promises-aplus-tests": "2.x"
   },
   "repository": {