Deprecate gtkmm version less than 3.22 #450
Merged
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Fixes #443
RFC-0006に基づきgtkmmのバージョンが3.22未満のプラットフォームはサポート終了予定になることをドキュメントに記載する。
これはDebian stretch(2017年)より前にリリースされたディストリビューションが該当する。
また、Debian stretchの環境を目安として必須・推奨環境の更新予定を追加する。