True TOML config support #32

Job	Run time
test 3.13 on ubuntu-latest	1m 54s
tox env type on ubuntu-latest	55s
test 3.13 on windows-latest	1m 46s
tox env type on windows-latest	1m 39s
test 3.13 on macos-latest	1m 53s
tox env dev on ubuntu-latest	41s
test 3.12 on ubuntu-latest	1m 59s
tox env dev on windows-latest	1m 27s
test 3.12 on windows-latest	1m 47s
tox env docs on ubuntu-latest	1m 54s
test 3.12 on macos-latest	1m 54s
tox env pkg_meta on ubuntu-latest	21s
test 3.11 on ubuntu-latest	1m 54s
tox env pkg_meta on windows-latest	48s
test 3.11 on windows-latest	1m 47s
test 3.11 on macos-latest	1m 55s
test 3.10 on ubuntu-latest	8s
test 3.10 on windows-latest	25s
test 3.10 on macos-latest	11s
test 3.9 on ubuntu-latest	7s
test 3.9 on windows-latest	25s
test 3.9 on macos-latest	12s
test 3.8 on ubuntu-latest	8s
test 3.8 on windows-latest	25s
test 3.8 on macos-latest	12s
	26m 47s

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