Add license to PyPI.

[dajiaji]

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[codecov]

Codecov Report

Merging #104 (ddabeea) into main (9d97394) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   98.72%   98.72%           
=======================================
  Files          14       14           
  Lines        1329     1329           
=======================================
  Hits         1312     1312           
  Misses         17       17           

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