Merge pull request #230 from tmcgee/greenkeeper/grunt-eslint-23.0.0

Update grunt-eslint to the latest version 🚀

Author: tmcgee

package.json

@@ -16,7 +16,7 @@
     "grunt-contrib-copy": "1.0.x",
     "grunt-contrib-csslint": "~2.0.0",
     "grunt-contrib-cssmin": "~3.0.0",
-    "grunt-eslint": "22.0.0",
+    "grunt-eslint": "23.0.0",
     "grunt-contrib-uglify": "~4.0.0",
     "grunt-contrib-watch": "~1.1.0",
     "grunt-newer": "~1.3.0",