Merge pull request #116 from philwareham/greenkeeper/grunt-concurrent-3.0.0

Update grunt-concurrent to the latest version 🚀

Author: philwareham

package-lock.json

@@ -13,7 +13,7 @@
     "cssnano": "4.1.10",
     "grunt": "~1.0",
     "grunt-cli": "~1",
-    "grunt-concurrent": "2.3.1",
+    "grunt-concurrent": "3.0.0",
     "grunt-contrib-clean": "2.0.0",
     "grunt-contrib-jshint": "1.1.0",
     "grunt-contrib-uglify": "4.0.0",