chore(package): update eslint to version 5.0.1

Closes #353

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "time-grunt": "^1.3.0"
   },
   "devDependencies": {
-    "eslint": "^4.18.0",
+    "eslint": "^5.0.1",
     "eslint-config-google": "^0.9.1",
     "eslint-config-xo": "^0.20.1"
   },