chore(package): update mocha to version 2.5.1 (#113)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -46,7 +46,7 @@
     "coveralls": "2.11.9",
     "cz-conventional-changelog": "1.1.6",
     "in-publish": "2.0.0",
-    "mocha": "2.4.5",
+    "mocha": "2.5.1",
     "nyc": "6.4.4",
     "react": "15.1.0",
     "tslint": "3.10.2",