[stzn/the-swift-programming-language-jp] Pull request closed: #347 ですます調ルールをstrict:falseに変更

[stzn/the-swift-programming-language-jp] Issue closed: #346 文中の「〜である〜」の使用

[stzn/the-swift-programming-language-jp] Pull request opened: #349 contributors readme action update