chore(package): update mocha to version 3.1.2

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -29,7 +29,7 @@
     "istanbul": "0.4.5",
     "jsdoc": "3.4.2",
     "kronos-test-interceptor": "2.0.5",
-    "mocha": "3.1.0",
+    "mocha": "3.1.2",
     "semantic-release": "6.3.1",
     "underscore": "1.8.3"
   },