update mocha

Author: ShMcK

package.json

@@ -26,7 +26,7 @@
   },
   "homepage": "https://github.com/coderoad/mocha-coderoad#readme",
   "dependencies": {
-    "mocha": "2.4.5",
+    "mocha": "2.5.3",
     "process-console-log": "0.2.0",
     "node-file-exists": "1.1.0"
   },