updated package json

package.json

@@ -25,7 +25,8 @@
     "jshint": ">=2.5.0",
     "uglifyify": "^2.6.0",
     "unreachable-branch-transform": "^0.1.0",
-    "vinyl-source-stream": "^1.0.0"
+    "vinyl-source-stream": "^1.0.0",
+    "mocha": ">=2.1.0"
   },
   "scripts": {
     "build": "gulp",