Replace Travis CI with GitHub Actions

[hugovk]

Fixes #156.

Travis CI has stopped working, so replace with GitHub Actions.

GHA is preferable over AppVeyor as they provide max 20 concurrent jobs compared to AppVeyor's one, so the build completes much faster.

Only added testing for supported versions, 3.8-3.12:

We can add 3.7 I think, but at least 2.7 and 3.6 are no longer available for testing, and I strongly suggest dropping support for them in another issue/PR.

Also add a tox.ini for easy testing of multiple Python versions locally.

I also replaced coveralls with codecov, because I've had difficulty setting up coveralls on GitHub Actions in the past, and there's been no updates to https://coveralls.io/github/decalage2/olefile?branch=master since 2017.

Demo

• https://github.com/hugovk/olefile/actions/runs/6969819195
• https://app.codecov.io/gh/hugovk/olefile/commit/da65f090a097fca447491d5bd2e3209ef53ca90e/tree

[decalage2]

Hi Hugo, thank you so much for your contributions on this!
Do you think it would be possible to keep AppVeyor in addition, just to run tests on python 2.7 and pypy2?

[hugovk]

You're welcome!

Sure, I updated .coveragerc to keep exclude_lines so it still works on ancient Python versions on AppVeyor.

[decalage2]

Thanks a lot!