fix: fix license classifier

[joostlek]

Hey 👋🏻,

I am currently looking into licensing at Home Assistant, and I found that we could not detect the license of this library properly. According to pyproject.toml documentation about the license field:

If you are using a standard, well-known license, it is not necessary to use this field. Instead, you should use one of the classifiers starting with License ::. (As a general rule, it is a good idea to use a standard, well-known license, both to avoid confusion and because some organizations avoid software whose license is unapproved.)

If you could do a release after this PR, and maybe bump in Home Assistant, that would be awesome :)

[akx]

Why was this removed, though? I'm pretty sure there are plenty of tools that read this field rather than classifiers?

[joostlek]

Because the classifier sets it on the license field in pypi iirc

[akx]

Ah, apparently it does the thing alright:

(ruuvitag-ble) ~/b/ruuvitag-ble (main) $ python
>>> import importlib.metadata as im
>>> im.metadata("ruuvitag-ble")
>>> m["License-Expression"]
'MIT'
>>>

Never mind! :)

[cdce8p]

This PR should probably be reverted.Hatchling prefers the license field of classifier. PyPI will add support for License-Expression soon as well.

https://hatch.pypa.io/1.11/config/metadata/#spdx-expression
pypi/warehouse#16620

[cdce8p]

Opened #25