chore(package): update mocha to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
   "devDependencies": {
     "eslint": "^4.8.0",
     "iconv": "^2.3.0",
-    "mocha": "^4.0.1",
+    "mocha": "^5.0.0",
     "request": "^2.83.0"
   },
   "scripts": {