Update dependency mocha to v3.5.3

Author: renovate[bot]

package.json

@@ -20,6 +20,6 @@
     "eslint-plugin-jsx-a11y": "4.0.0",
     "eslint-plugin-react": "6.10.3",
     "istanbul": "0.4.5",
-    "mocha": "3.2.0"
+    "mocha": "3.5.3"
   }
 }