v1.3.0 - Typer support & refactoring

✨ New features

This release contains two main chunks of work:

• Initial support for @tiangolo's Typer, added by @browniebroke [#26]
• A fairly major overhaul of the code to introduce typing and additional code linting (pre-commit with iSort, mypy, Flake8), by @Jorricks [#37, #39, #40]

✍🏻 Output changes:

• Change metavar overflow to fold, so that large numbers of choices flow onto new lines instead of being truncated with an ellipsis [#33]
• Make metavar separators dim ([],<>) (customise with STYLE_METAVAR_SEPARATOR)
• Parse emoji shortcodes :partying_face: [#51]

🐛 Bug fixes:

• Fixed bug where --no-myflag wasn't showing in the help [#45]

👨🏻‍💻 Code changes:

• Distribution now available via MacPorts [#42]
• Pushed minimum version of Python up to 3.7, in line with Click v8.1
• Mark PEP 561 Compatibility [#41]
• Monkey-patch RichCommand and RichGroup in CLI code for better rich-click compatability with more tools [#43]

Full Changelog: v1.2.1...v1.3.0