Travis job is not started: fix or migrate to Actions?

[JeroenVanOort]

I was working on #15 and I noticed that no Travis job is started. Is this something to be fixed or should a move be made towards Github Actions?

[Yozhef]

@rincler @samizdam @bottleneko Hello everybody. Guys, tell me about your next plans to support this repository?
Maybe if you need help I can help you update this repository?

[rincler]

Hi! I support this repo.
I've released changes for compatibility of php 8, but I did not pay attention to broken tests, so I've marked last release as YANKED. It seems to need to update phpunit dependency. I will resolve problems in the near future.

[Yozhef]

@rincler How do you feel about making some changes?:

1. Code style
2. Code style check
3. PHPStan
4. Change Travis to GitHub action

I can help you with that.