Remove WIP + rubygem badge

Author: nicovak

README.md

@@ -1,6 +1,8 @@
-[WIP] - RailsAdmin Rollincode Theme
+RailsAdmin Rollincode Theme
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+[![Gem Version](https://badge.fury.io/rb/rails_admin_rollincode.svg)](https://badge.fury.io/rb/rails_admin_rollincode)
+
 This theme provide a modern override of default bootstrap 3 rails_admin theme.
 Its provides news colors, adjustments and a brand new tree view menu.