investigate-ci

Revert "investigate-ci"

This reverts commit 7925bca.

Temporary fix to make tests run smoothly

As far as I can tell, mypy does not handle unreachable warnings (which are used in some of the tests) correctly in version 0.920, therefore a version before that is enforced for now.

fix format

maybe this time

wrong file

Revert "investigate-ci"

This reverts commit 64af803.

Author: Richardk2n