Update requirements for dependencies (gtkmm >= 3.22) #566
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2017年以降にリリースされたディストロには搭載されていない古いGTK(3.18 ~ 3.22)のサポートを終了します。
合わせてgnutlsのバージョン要件とgtkmmの推奨環境も更新します。
互換性に関する注意
Debian stretchより古いプラットフォームではビルドと実行が困難になります。
関連のissue: #443