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

Author: renovate-bot

package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "chai": "4.2.0",
     "eslint": "4.19.1",
-    "mocha": "5.1.1"
+    "mocha": "5.2.0"
   },
   "eslintConfig": {
     "env": {