upgrading_ruby_on_rails.mdを更新
upgrading_ruby_on_rails.mdを更新

https://github.com/rails/rails/compare/1e526788e6b1d3f42f4d8fdca20e588d42838c80...master#diff-c61df9502e3f112e8392d43ad44ec1e4
を参照

yasslab/railsguides.jp,yasslab/railsguides.jp,yasslab/railsguides.jp,yasslab/railsguides.jp