update grunt-banner version

Author: onokumus

package.json

@@ -43,7 +43,7 @@
     "css-flip": "^0.5.0",
     "grunt": "^1.0.1",
     "grunt-autoprefixer": "^3.0.4",
-    "grunt-banner": "^0.3.1",
+    "grunt-banner": "^0.6.0",
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-concat": "^0.5.0",
     "grunt-contrib-connect": "^0.9.0",