build

Updating code, removing deprecated patterns, general future compat #623

Job	Run time
Build docker image and run tests	4m 54s
tests (3.7)	2m 34s
tests (3.8)	2m 46s
tests (3.9)	2m 56s
tests (3.10)	3m 16s
Finish Coveralls	1s
	16m 27s

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