post_tags の論理削除と履歴管理を廃止 (#411) (#417)

Reviewed-on: #417
Co-authored-by: miteruzo <miteruzo@naver.com>

backend/config/routes.rb

@@ -55,7 +55,6 @@ Rails.application.routes.draw do
       get :metadata
       post :bulk
       get :random
-      get :changes
       get :versions, to: 'post_versions#index'
     end