Remove Travis CI and Appveyor configurations #1360
Merged
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We've been using GitHub Actions successfully for a while now, and Travis CI has been increasingly problematic.
This PR removes the Travis CI and Appveyor configurations, leaving only the GitHub actions.
EDIT: This PR also removes the restriction on installing NumPy on Python 3.9. That restriction was only there for the benefit of Travis CI - installing NumPy on the GitHub Actions platform seems to work fine.
EDIT: This PR additionally removes all Python 3.9 restrictions!