Bump version to 4.0.0 #68

Job	Run time
Build source distribution	9s
Build wheels manylinux1 auto64 on ubuntu-latest	2m 3s
Build wheels manylinux2010 auto64 on ubuntu-latest	2m 9s
Run tests 3.9 on ubuntu-20.04	40s
Build wheels manylinux2014 auto64 on ubuntu-latest	3m 7s
Run tests 3.10 on ubuntu-20.04	30s
Build wheels universal2 on macos-latest	2m 58s
Build wheels auto64 on windows-latest	5m 44s
Run tests 3.11 on ubuntu-20.04	31s
Run tests 3.12 on ubuntu-20.04	33s
Run tests 3.13 on ubuntu-20.04	39s
Run tests 3.9 on ubuntu-22.04	31s
Run tests 3.10 on ubuntu-22.04	31s
Run tests 3.11 on ubuntu-22.04	28s
Run tests 3.12 on ubuntu-22.04	28s
Run tests 3.13 on ubuntu-22.04	41s
Run tests 3.9 on macos-12	37s
Run tests 3.10 on macos-12	32s
Run tests 3.11 on macos-12	34s
Run tests 3.12 on macos-12	39s
Run tests 3.13 on macos-12	1m 34s
Run tests 3.9 on macos-13	44s
Run tests 3.10 on macos-13	43s
Run tests 3.11 on macos-13	36s
Run tests 3.12 on macos-13	1m 8s
Run tests 3.13 on macos-13	1m 37s
Run tests 3.9 on windows-2019	1m 27s
Run tests 3.10 on windows-2019	1m 15s
Run tests 3.11 on windows-2019	1m 22s
Run tests 3.12 on windows-2019	1m 24s
Run tests 3.13 on windows-2019	1m 27s
Run tests 3.9 on windows-2022	1m 0s
Run tests 3.10 on windows-2022	1m 13s
Run tests 3.11 on windows-2022	1m 25s
Run tests 3.12 on windows-2022	1m 14s
Run tests 3.13 on windows-2022	1m 32s
Run tests 3.10 on macos-14	21s
Run tests 3.11 on macos-14	19s
Run tests 3.12 on macos-14	21s
Run tests 3.13 on macos-14	27s
merge	9s
Check distributions are PyPi-correct	8s
	45m 30s

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