License info missing in classifiers and/or meta data

[daveshih01]

Sorry to bother you.
Larger enterprises scan packages before allowing them into their internal pypi index, and one of the things they scan for is the license information. This is typically done via scanning the meta data (whatever pip show reports) and classifiers in pyproject.toml. Please can you add the necessary license information in both places? Thanks much!
You can mirror what the main pydantic package is doing because that one is working and passed our internal scanner.

[Kludex]

Would you mind sending a PR with it? I'll shortly make a release with it. I thought everything was fine license wise, but I can see it's not mentioned on PyPI.

[daveshih01]

Sorry about the delay. I've created the PR at #131
First PR ever in github so please excuse me for missing stuff. Thanks.

[Kludex]

• Closed by Added license information to classifiers in pyproject.toml #131