chore(package): update mocha to version 2.4.4

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -36,7 +36,7 @@
     "coveralls": "2.11.6",
     "cz-conventional-changelog": "1.1.5",
     "in-publish": "2.0.0",
-    "mocha": "2.4.2",
+    "mocha": "2.4.4",
     "nyc": "5.5.0",
     "react": "0.14.6",
     "tslint": "3.3.0",