chore(package): update mocha to version 3.1.2 (#195)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -45,7 +45,7 @@
     "coveralls": "2.11.14",
     "cz-conventional-changelog": "1.2.0",
     "in-publish": "2.0.0",
-    "mocha": "3.1.1",
+    "mocha": "3.1.2",
     "nyc": "8.3.1",
     "react": "15.3.2",
     "standard-version": "3.0.0",