Use Github actions for CI

[avdv]

Description

Integration with Travis CI (org) is broken for a few months already, and travis-ci.org is going to be shut down in favor of travis-ci.com which does not allow builds on macos freely.

Thanks for contributing this Pull Request. Add a brief description of what this Pull Request does. Do tag the relevant issue(s) and PR(s) below. If required, add some screenshot(s) to support your changes.

• Relevant Issues : (none)
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation

[codecov-commenter]

Codecov Report

Merging #458 (74adb53) into master (6f4b0d3) will not change coverage.
The diff coverage is n/a.

❗ Current head 74adb53 differs from pull request most recent head 22fb57a. Consider uploading reports for the commit 22fb57a to get more accurate results

@@           Coverage Diff           @@
##           master     #458   +/-   ##
=======================================
  Coverage   88.65%   88.65%           
=======================================
  Files           8        8           
  Lines         564      564           
=======================================
  Hits          500      500           
  Misses         64       64           

---

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 6f4b0d3...22fb57a. Read the comment docs.