chore(deps): update dependency mocha to v5.2.0

Author: renovate-bot

package-lock.json

@@ -56,7 +56,7 @@
     "husky": "0.14.3",
     "istanbul": "0.4.5",
     "lint-staged": "7.1.1",
-    "mocha": "5.1.1",
+    "mocha": "5.2.0",
     "prettier-standard": "8.0.1",
     "proxyquire": "1.8.0"
   },