chore(package): update mocha to version 3.0.2 (#588)

https://greenkeeper.io/

package.json

@@ -42,7 +42,7 @@
   "devDependencies": {
     "chai": "^3.4.0",
     "eslint": "^2.5.1",
-    "mocha": "^2.5.0",
+    "mocha": "^3.0.2",
     "zuul": "^3.7.0"
   },
   "spm": {