update mocha

Author: Benjamin E White

package.json

@@ -26,6 +26,6 @@
     "chai": "^4.0.1",
     "chai-http": "^3.0.0",
     "faker": "^3.1.0",
-    "mocha": "^3.4.2"
+    "mocha": "^4.0.1"
   }
 }