Update README.md

removed the default array for tag_list. Rails4 didn't actually like this

README.md

@@ -89,7 +89,7 @@ end
 
 class UsersController < ApplicationController
   def user_params
-    params.require(:user).permit(:name, :tag_list => []) ## Rails 4 strong params usage
+    params.require(:user).permit(:name, :tag_list) ## Rails 4 strong params usage
   end
 end