v0.19.0 zsh completion, automatic .gitignore entries

What's Changed

• update files of remote tegonal-gh-commons to version v2.7.1 via gt by @tegonal-bot in #179
• automatically add .gitignore patterns during working-directory creation by @robstoll in #180
• fix ascii colouring by @robstoll in #181
• Bugfix/typo in pull param doc by @robstoll in #182
• add zsh completions during installation by @robstoll in #184

Full Changelog: v0.18.0...v0.19.0