readme cleanup (#382) #1062

Job	Run time
test-package (3.13)	9m 56s
Test docker image on ubuntu-latest	1m 59s
test-package (3.10)	12m 5s
test-package (3.9)	11m 38s
test-package (3.11)	10m 22s
test-package (3.12)	11m 0s
test-package (3.8)	11m 51s
	1h 8m 51s

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