Test against both release version and current master in CI tests
Bump required Python version to 3.8
Update installation instructions
Fixes #198
Fixes #210
Fixes #220
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Jitse Niesen
Fixes #198 Fixes #210 Fixes #220
Affirmation
By submitting this Pull Request or typing my (user)name below, I affirm the Developer Certificate of Origin with respect to all commits and content included in this PR, and understand I am releasing the same under Spyder's MIT (Expat) license.
I certify the above statement is true and correct: Jitse Niesen