build

Updating code, removing deprecated patterns, general future compat (#87) #625

Job	Run time
tests (3.7)	2m 42s
tests (3.8)	2m 48s
Build docker image and run tests	4m 54s
tests (3.9)	2m 39s
tests (3.10)	3m 21s
Finish Coveralls	7s
	16m 31s

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