CI: Modernize, MOAR Pythons, GH-Actions

[stdedos]

Should I drop travis too? ... Unless we have a subscription?

[Pierre-Sassoulas]

Yeah definitely should get rid of travis for github actions. Maybe you can use the job from pylint directly (pypy etc.) ?

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (master@6267638). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1 +/- ## ========================================= Coverage ? 86.50% ========================================= Files ? 33 Lines ? 400 Branches ? 81 ========================================= Hits ? 346 Misses ? 50 Partials ? 4 ```

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[Pierre-Sassoulas]

Here's a starter pre-commit file need to be in .pre-commit-config.yaml

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.5.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer

[stdedos]

I'm going to fix it next MR 🙏

I already threw a lot of stuff here

[stdedos]

I guess this will have to do for now. Can I get a second thumbs-up?