Upgrade version Mocha (#16842)

Author: s1lver

package.json

@@ -11,7 +11,7 @@
     "chai": "^3.5.0",
     "jsdom": "11.11.0",
     "leche": "^2.2.3",
-    "mocha": "^3.5.3",
+    "mocha": "^5.2.0",
     "mocha-jsdom": "^2.0.0",
     "sinon": "^1.17.6"
   },