Merge pull request #1118 from d2s/d2s-add-missing-mocha-dependency

fix(package.json) fix failing test suite

Author: varya

package.json

@@ -111,6 +111,7 @@
     "karma-phantomjs-launcher": "~1.0.0",
     "karma-sinon-chai": "~1.1.0",
     "main-bower-files": "~2.9.0",
+    "mocha": "^3.5.3",
     "node-localcache": "^0.1.3",
     "phantomjs-prebuilt": "2.1.7",
     "proxyquire": "~1.7.3",