Bumped version to 0.8.1 #76

Job	Run time
musllinux (x86_64-unknown-linux-musl)	5m 19s
linux (x86_64)	5m 54s
macos (x86_64)	5m 39s
musllinux (i686-unknown-linux-musl)	5m 36s
sdist	29s
linux (x86)	8m 15s
macos (aarch64)	5m 7s
linux (aarch64)	6m 20s
windows (x64)	11m 19s
linux (armv7)	6m 9s
windows (x86)	11m 49s
linux (s390x)	6m 16s
linux (ppc64le)	6m 5s
Release	2m 38s
	1h 26m 55s

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