improvements in readme #1923

Job	Run time
Check that transforms docs are not outdated (3.8)	25s
Check code formatting with Black, isort, mypy, flake8 (3.8)	35s
Test and lint (ubuntu-latest, 3.8)	2m 23s
Test and lint (ubuntu-latest, 3.9)	3m 51s
Test and lint (ubuntu-latest, 3.10)	4m 7s
Test and lint (ubuntu-latest, 3.11)	3m 55s
Test and lint (ubuntu-latest, 3.12)	3m 46s
Test and lint (windows-latest, 3.8)	4m 39s
Test and lint (windows-latest, 3.9)	6m 20s
Test and lint (windows-latest, 3.10)	7m 0s
Test and lint (windows-latest, 3.11)	6m 51s
Test and lint (windows-latest, 3.12)	6m 0s
Test and lint (macos-latest, 3.8)	6m 22s
Test and lint (macos-latest, 3.9)	9m 9s
Test and lint (macos-latest, 3.10)	6m 18s
Test and lint (macos-latest, 3.11)	8m 17s
Test and lint (macos-latest, 3.12)	7m 33s
	1h 27m 31s

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