Python CI

update CHANGELOG, readme and init for release 2.1.1 #958

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Run time

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Job	Run time
build (ubuntu-22.04, 3.7, 9.1)	8m 11s
build (ubuntu-latest, 3.13, latest)	9m 19s
build (ubuntu-latest, 3.9, latest)	8m 51s
build (ubuntu-latest, 3.9, 9.4)	9m 13s
	35m 34s