LICENSE file missing in PyPI release

[janjagusch]

Hi! 👋

Thanks for maintaining this package. I'm trying to add mlinsights to conda-forge but it turns out to be a bit difficult because the LICENSE.txt is not packaged into mlinsights-0.3.549.tar.gz.

I think that should be as easy as adjusting the MANIFEST.in. I can open a PR for this next week, if that's okay for you. 😄

[sdpython]

Thanks, I'll fix this soon.

[sdpython]

The package was recently release the license.