Build and test

Create release notes markdown output for `diff` command #1813

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Run time

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Job	Run time
lint (3.9)	29s
test (ubuntu-latest, 3.9)	36m 17s
test (ubuntu-latest, 3.10)	39m 21s
lint (3.10)	32s
test (windows-latest, 3.10)	41m 19s
	1h 57m 58s