Update mocha

Author: niklasvh

package-lock.json

@@ -51,7 +51,7 @@
     "karma-ie-launcher": "1.0.0",
     "karma-mocha": "1.3.0",
     "karma-sauce-launcher": "1.1.0",
-    "mocha": "3.5.0",
+    "mocha": "5.2.0",
     "platform": "1.3.4",
     "prettier": "1.5.3",
     "promise-polyfill": "6.0.2",