release 4.20.0 #8

Job	Run time
tox env type on ubuntu-latest	53s
tox env type on windows-latest	2m 13s
test 3.13 on ubuntu-latest	4m 17s
tox env dev on ubuntu-latest	34s
tox env dev on windows-latest	1m 19s
test 3.13 on windows-latest	13m 45s
tox env docs on ubuntu-latest	5m 37s
test 3.13 on macos-latest	5m 23s
tox env pkg_meta on ubuntu-latest	20s
test 3.12 on ubuntu-latest	4m 28s
tox env pkg_meta on windows-latest	47s
test 3.12 on windows-latest	13m 21s
test 3.12 on macos-latest	5m 29s
test 3.11 on ubuntu-latest	3m 14s
test 3.11 on windows-latest	8m 6s
test 3.11 on macos-latest	4m 42s
test 3.10 on ubuntu-latest	3m 23s
test 3.10 on windows-latest	13m 14s
test 3.10 on macos-latest	4m 9s
test 3.9 on ubuntu-latest	3m 34s
test 3.9 on windows-latest	11m 43s
test 3.9 on macos-latest	4m 46s
test 3.8 on ubuntu-latest	3m 37s
test 3.8 on windows-latest	14m 42s
test 3.8 on macos-latest	4m 21s
	2h 17m 57s

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