Move CI from Travis to GitHub Actions

[siriak]

• [x] I have performed a self-review of my code
• [x] My code follows the style guidelines of this project
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Comments in areas I changed are up to date
• [ ] I have added comments to hard-to-understand areas of my code
• [ ] I have made corresponding changes to the README.md

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8a5db71) 95.75% compared to head (d0d9bd9) 95.75%.

:exclamation: Current head d0d9bd9 differs from pull request most recent head 4d94705. Consider uploading reports for the commit 4d94705 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #388 +/- ## ======================================= Coverage 95.75% 95.75% ======================================= Files 218 218 Lines 8887 8887 ======================================= Hits 8510 8510 Misses 377 377 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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