Travis is sunsetting .org

[asmeurer]

According to https://docs.travis-ci.com/user/migrate/open-source-repository-migration#frequently-asked-questions, .org will be completely migrated to .com by the end of the year.

[asmeurer]

This probably won't technically require a doctr update, as we already support both and detect which is being used (unless they change the API somehow). But we should remove .org support from doctr once .org stops running.

[moorepants]

Any thoughts on having doctr work with CI other than travis? I use it for a number of projects, but it would be nice to jump ship from Travis at this point. The future isn't looking that great for that service for open source.

[asmeurer]

See #351

[goerz]

It seems Travis no longer supports OSS at all, at this point: https://twitter.com/james_hilliard/status/1336081776691843072

I'm definitely looking to move to GH Actions :-/