Migrate CI service from Travis to GitHub Actions

[raimon49]

Migrated to GitHub Actions due to the deteriorating performance of Travis...

See also)

• https://docs.github.com/ja/free-pro-team@latest/actions/learn-github-actions/migrating-from-travis-ci-to-github-actions
• https://docs.github.com/en/free-pro-team@latest/actions/guides/building-and-testing-python
• https://github.com/codecov/codecov-action

[codecov[bot]]

Codecov Report

Merging #85 (68e2208) into master (51d8f95) will increase coverage by 0.28%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   98.58%   98.86%   +0.28%     
==========================================
  Files           1        1              
  Lines         353      353              
==========================================
+ Hits          348      349       +1     
+ Misses          5        4       -1     

Impacted Files	Coverage Δ
piplicenses.py	98.86% <0.00%> (+0.28%)	:arrow_up:

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