I long ago switched to CircleCI for all my builds-- it has free builds for both open source and private repositories with a simple (and comparatively inexpensive) pricing plan based on parallel builds with Windows, macOS and Linux build containers.
With Github Actions on the scene now, I don't see much reason to use Travis over one of the alternatives.
With Github Actions on the scene now, I don't see much reason to use Travis over one of the alternatives.