New travis pricing

[rbuffat]

https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing

For those of you who have been building on public repositories (on travis-ci.com, with no paid subscription), we will upgrade you to our trial (free) plan with a 10K credit allotment (which allows around 1000 minutes in a Linux environment). You will not need to change your build definitions when you are pointed to the new plan When your credit allotment runs out - we’d love for you to consider which of our plans will meet your needs. We will be offering an allotment of OSS minutes that will be reviewed and allocated on a case by case basis. Should you want to apply for these credits please open a request with Travis CI support stating that you’d like to be considered for the OSS allotment.

[rbuffat]

It should be fairly easy to port the travis tests to github CI. I could create a PR.

[sgillies]

Done!