Add macos to ci.yml

[rhpvorderman]

Checklist

• Pull request details were added to CHANGELOG.rst

[codecov]

Codecov Report

Merging #30 (d9f70fe) into develop (605a2d3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #30   +/-   ##
========================================
  Coverage    86.76%   86.76%           
========================================
  Files            2        2           
  Lines          136      136           
========================================
  Hits           118      118           
  Misses          18       18           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 605a2d3...d9f70fe. Read the comment docs.