Ensure support for Python 3.12 and older versions

[Jamim]

Hello @miguelgrinberg,

Thank you for this library! 🙇🏻‍♂️

I believe it would be nice to ensure support for Python 3.12 and older versions, so I'd like to suggest changes that:

• enable testing against Python 3.12/3.6 and PyPy 3.10/3.9/3.7/3.6
• update classifiers at pyproject.toml
• bump actions/checkout from v3 to v4
• bump actions/setup-python from v3 to v5
• clean up tox.ini
• make CI output colorful

Unfortunately, I haven't found a way to make tox work with pyproject.toml on Python 3.6, so, as a workaround, pytest is used directly when testing against Python 3.6.

Best regards!

[miguelgrinberg]

While I appreciate this change, unfortunately I cannot accept it as currently formatted. There are a number of things that you have included that are trivial style preferences that do not actually improve the project in any way. Considering that I have to maintain over a dozen open source projects I prefer to keep everything consistent among them and when/if I decide to make CI improvements apply the same changes across the board.

[Jamim]

Thank you for the feedback! Your project, your rules. Is there a chance you consider accepting any of atomic PRs that, keeping existing style as much as possible

• enable testing against Python 3.12 (and only 3.12);
• add classifiers that corresponds to Python version constraints (it's always better to see which versions are supported explicitly);
• or enable testing against Python 3.6 on CI (IMHO, nice to have while requires-python = ">=3.6")?

[miguelgrinberg]

I added 3.12 to the CI build, and also upgraded pypy to use the 3.10 compatible version. I'm not going to add 3.6 and I'm not going to add classifiers that will require constant updates. Sorry.