Remove require

Author: grzegorz-jakubiak

lib/active_admin/mongoid.rb

@@ -16,7 +16,6 @@
 require 'active_admin/mongoid/association/relatable'
 
 require 'active_admin/mongoid/inputs/filters/check_boxes_input'
-require 'active_admin/mongoid/inputs/filters/select_input'
 require 'active_admin/mongoid/filters/active_filter'
 require 'active_admin/mongoid/filters/resource_extension'
 require 'active_admin/mongoid/controllers/resource_controller'