Removed deprecated `type` parameter
Removed deprecated `type` parameter

ActiveAdmin 1.1.0 deprecates `type` parameter: https://github.com/activeadmin/activeadmin/commit/484a0515b2f48a16dd511d60737801cdc4c65209
This change is compatible with previous versions, as `type` parameter will be `nil` (its default value) and the `class` option will have the CSS class that will be used.
mabdelfattah/activeadmin_addons,mabdelfattah/activeadmin_addons,mabdelfattah/activeadmin_addons,platanus/activeadmin_addons,platanus/activeadmin_addons,mabdelfattah/activeadmin_addons,platanus/activeadmin_addons,platanus/activeadmin_addons