Expand Github Actions: Test with linux + windows + MacOS

[jedie]

No description provided.

[codecov]

Codecov Report

Merging #6 into master will decrease coverage by 0.56%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage      87%   86.44%   -0.57%     
==========================================
  Files          13       13              
  Lines         531      531              
  Branches       59       59              
==========================================
- Hits          462      459       -3     
- Misses         51       52       +1     
- Partials       18       20       +2

Impacted Files	Coverage Δ
iterfilesystem/main.py	90.16% <0%> (-2.46%)	⬇️

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