* ✨ Re-implement completion
* ✅ Add tests for re-implemented completion
* 🎨 Move mypy config to file
* 🙈 Update .gitignore
* ➕ Remove click-completion, add support for autodetection with shellingham
* ✅ Fix test for PowerShell
* 🐛 Fix PowerShell permissions/test
* 🎨 Format test
* 🏁 Fix PowerShell script for Windows and PowerShell 5
* 📝 Update docs, internal implementation of completion
