chore(package): update mocha to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "eslint": "^4.15.0",
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-plugin-import": "^2.8.0",
-    "mocha": "^4.0.0",
+    "mocha": "^5.0.0",
     "nyc": "^11.4.1",
     "sinon": "^4.0.0"
   },