Update dependency mocha to v5

Author: renovate-bot

package.json

@@ -27,7 +27,7 @@
     "karma-mocha": "1.3.0",
     "karma-phantomjs-launcher": "0.2.3",
     "karma-requirejs": "1.1.0",
-    "mocha": "2.5.3",
+    "mocha": "5.2.0",
     "react": "0.13.3",
     "requirejs": "2.3.5",
     "rquery": "2.0.9",