Fix RAILS_VERSION check
Fix RAILS_VERSION check

zorab47/activeadmin-sortable-tree,hotvulcan/activeadmin-sortable-tree,hotvulcan/activeadmin-sortable-tree,zorab47/active_admin-sortable_tree,zorab47/activeadmin-sortable-tree,hotvulcan/activeadmin-sortable-tree,zorab47/active_admin-sortable_tree,zorab47/activeadmin-sortable-tree,zorab47/active_admin-sortable_tree