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Migrate CI to GitHub Actions
This PR migrates CI to GitHub Actions, now that Travis CI.org is no longer active.
I had to make a choice as to what Rubies / ActiveSupport versions to run. I chose "recent" Rubies (Ruby 2.5+) and ActiveSupport minor versions 5.2.x, 6.0.x, 6.1.x, 7.0.x
Appraisals was updated and gemfiles were added to support more recent ActiveSupport versions. Additional changes included updating the 5.2 gemfile so it no longer refers to a beta version.
This runs green on my fork.
We need @javan to enable Github Actions for this to work; I don't have access to the repo settings to do so.