Adopt PEP 639 license statement in pyproject.toml

[lmkimme]

Hi,

thanks for the bindings 🙂 !

recently I scanned a virtual environment of mine and found that loro-py was the only package among 80 or so that showed up with license: UNKNOWN when running something like $ pip-licenses --from=mixed --format=rst.

I guess this is due to license = { file = "LICENSE" } being the only license info in pyproject.toml. The license file gets copied to the wheel, but no meta-information is provided.

I suggest to follow https://packaging.python.org/en/latest/specifications/pyproject-toml

-- Lukas

[Leeeon233]

Thanks