Use license_files instead of license_file in setup.cfg

[bkmgit]

Use license_files instead

[bkmgit]

See https://setuptools.pypa.io/en/latest/userguide/declarative_config.html#metadata

[mahmoud]

Interesting, though that link doesn't specify that license_file is deprecated, just that it has a new alias. Is there another source you can point me to? Can you elaborate on why we'd introduce an implicit minimum version of setuptools (42.0.0)?

[bkmgit]

This is a warning that came up when building for inclusion on Fedora linux. See the log:
https://download.copr.fedorainfracloud.org/results/@fedora-review/fedora-review-2252017-python-boltons/fedora-rawhide-x86_64/06705253-python-boltons/builder-live.log.gz

Is there a good way to support multiple versions of setuptools/python?

[mahmoud]

Got it, thanks for the log. I've opened an issue on setuptools to update their docs: pypa/setuptools#4147

As for version management, I think we're ok to upgrade. I looked up the setuptools version and any version released after 2019 should be fine. We could add setuptools>42 or something to setup_requires, but that'd mostly be as a form of documentation.