Update dependency grunt-contrib-clean to v2

Author: renovate-bot

themes/minos/package.json

@@ -6,7 +6,7 @@
     "grunt": "0.4.5",
     "load-grunt-tasks": "0.2.1",
     "grunt-git": "0.2.14",
-    "grunt-contrib-clean": "0.7.0",
+    "grunt-contrib-clean": "2.0.1",
     "grunt-contrib-copy": "0.4.1"
   }
 }