travis.org seems gone, we need to find something else?

There was a CI builder, which mainly useful for macos building.

It seems it's no more working: 

https://travis-ci.community/t/org-com-migration-unexpectedly-comes-with-a-plan-change-for-oss-what-exactly-is-the-new-deal/10567

Do we need a CI for `docopts`?
How to setup a new CI?


 

