Moved to GitHub Actions and GitHub Packages

[freemanjp]

• Travis CI have discontinued their free open-source plan
• BinTray are discontinuing their free open-source plan

[codecov]

Codecov Report

Merging #297 (87fa9df) into master (c8456dd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #297   +/-   ##
=========================================
  Coverage     85.02%   85.02%           
  Complexity       89       89           
=========================================
  Files             8        8           
  Lines           494      494           
  Branches         82       82           
=========================================
  Hits            420      420           
  Misses           35       35           
  Partials         39       39           

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