Add macOS CI

Fixes #99 (closed)

Created by: codecov[bot]

Codecov Report

Merging #176 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   96.85%   96.85%           
=======================================
  Files          46       46           
  Lines        3653     3653           
  Branches      474      474           
=======================================
  Hits         3538     3538           
  Misses         77       77           
  Partials       38       38           

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