Build Migration Release

This release reflects builds moving off of Travis and on to Github Actions.

If you are using Python 3 you should see no changes. Support for Python 2 is dropped.

Wheels have always been built on Travis; when they were first set up Github Actions didn't exist. Travis will be closing down the .org domain builds were using soon, and their pricing plan is changing in a way that could potentially affect builds. Since builds aren't terribly complicated anyway they have been migrated to Github Actions.

A side effect of this is that Github Actions has no support for Python 2. Since Python 2 met end of life a while ago, support was maintained as long as it was zero effort. It would no longer be zero effort so the time has come to remove it. If you need Python 2 I suggest you get a new job, but you can keep using v1.0.2.