fix "The InstanceMethods module inside ActiveSupport::Concern will be no longer included automatically."

lib/two_factor_authentication/controllers/helpers.rb

@@ -7,7 +7,6 @@ module TwoFactorAuthentication
         before_filter :handle_two_factor_authentication
       end
 
-      module InstanceMethods
       private
 
       def handle_two_factor_authentication
@@ -31,4 +30,3 @@ module TwoFactorAuthentication
     end
   end
 end
-end