Migrate to a new CI platform

[johnthagen]

If you navigate here: https://travis-ci.org/github/PistonDevelopers/piston

Since June 15th, 2021, the building on travis-ci.org is ceased. Please use travis-ci.com from now on.

This project will need to migrate to either GitHub Actions or Circle CI. GitHub Actions seems to be the most popular currently.

Travis CI (.com) is no longer free for FOSS projects

[Sable-20]

Why not just use travis-ci.com it says you can migrate there

correct me if im wrong and you cant just migrate

edit: just noticed their no longer free notice, i would recommend GH Actions