Replace Travis with GitHub Actions

[akx]

Fixes #8

[codecov-commenter]

Codecov Report

Merging #9 (6d02bb1) into master (d4c9a22) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #9   +/-   ##
=======================================
  Coverage   96.69%   96.69%           
=======================================
  Files          15       15           
  Lines         242      242           
  Branches       13       13           
=======================================
  Hits          234      234           
  Misses          5        5           
  Partials        3        3           

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[akx]

Self-merging since this clearly works :)