I recently discovered a number of issues with the current Travis CI process. These issues have let a number of regressions slip through. I have fixed some in a57f4b5 and 4d820e5. I have additional changes I'm working on to resolve failures seen here: https://travis-ci.org/github/iliekturtles/uom/jobs/742299009

• Builds not executing for PRs
• Builds executing after a significant delay.
• Builds not responding cancel requests.
• Travis CI made changes that caused the exclude keyword to start causing explicitly specified jobs to be skipped. This caused the most import test job to be skipped.
• Code coverage is not being reported.

How should the issues be fixed?

• Fix Travis CI issues?
• Switch to GitHub actions (https://github.com/actions-rs)?
• Switch to another CI provider? Azure?