LICENSE is not packaged

[shobsi]

The installed package does not contain LICENSE file

$ ls lib/python3.10/site-packages/webencodings-0.5.1.dist-info/
DESCRIPTION.rst  INSTALLER  METADATA  metadata.json  RECORD  REQUESTED  top_level.txt  WHEEL

We should probably replace license_file -> license_files in setup.cfg or simply remove that line (since LICENSE is a standard name and should be packaged by default).

[adamchainz]

I believe this was fixed in #13, just there has been no release since.