Switch to GitHub Actions

[realityking]

Travis-ci.org is in the process of shutting down: https://docs.travis-ci.com/user/migrate/open-source-repository-migration#frequently-asked-questions

react-waypoint could be migrated to .com but they've cut down the build minutes quite a bit. Would you be up for migrating to GitHub Actions instead?

[trotzig]

Switching to github actions sounds like a good idea. 👍