Travis migrated to travis-ci.com

[marcosdemelo]

Here’s the TL;DR version:

• Travis-ci.org shut down will occur on May 31, 2021
• This change is to ensure product updates and fixes can be implemented for all users, at the same time
• All your repositories on travis-ci.org should be migrated to travis-ci.com before May 31, 2021 to avoid builds not running
• All repositories – private, and public – will continue to build as expected on travis-ci.com once migrated
• Your historic build data on travis-ci.org will remain available in a read-only state for an indefinite period

https://blog.travis-ci.com/2021-05-07-orgshutdown

@annacruz , if you want to ditch travis or just add support for github actions, let me know and I'll submit a PR configuring github actions in the project.