update grunt-contrib-clean version

Author: onokumus

package.json

@@ -44,7 +44,7 @@
     "grunt": "^1.0.1",
     "grunt-autoprefixer": "^3.0.4",
     "grunt-banner": "^0.6.0",
-    "grunt-contrib-clean": "^0.6.0",
+    "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-concat": "^0.5.0",
     "grunt-contrib-connect": "^0.9.0",
     "grunt-contrib-copy": "^0.7.0",