Git認証情報のクリア
設定の確認
git config --global --list
Mac(https://stackoverflow.com/questions/11067818/how-do-you-reset-the-stored-credentials-in-git-credential-osxkeychain)
$ git credential-osxkeychain erase ⏎
host=github.com ⏎
protocol=https ⏎
⏎
⏎
# Windowsの場合
git config --system --unset credential.helper
# macOS/Linuxの場合
git config --global --unset credential.helper