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Update linter (#177)

* Update to flake8 v6 & re-satisfy lint rules

* Simplify .gitignore with .* rule

* Update CI script dependencies

* Run CI unit tests on Ubuntu 20.04 to retain Python 3.6 support

* Specify PyPy minor version for CI unit tests
E
Eemeli Aro committed
4c38856946deabbbe8efc9683b378eed5a9f4bc7
Parent: 4479dc6
Committed by GitHub <noreply@github.com> on 2/7/2023, 5:13:35 PM