v0.21.0 #300

Job	Run time
Cargo.lock	4s
build sdist	12s
build on linux (x86_64 - auto)	2m 48s
build on linux (aarch64 - auto)	3m 12s
build on macos (x86_64 - auto)	3m 7s
build on macos (aarch64 - auto)	3m 10s
build on windows (x86_64 - auto)	4m 28s
build on windows (i686 - auto)	3m 40s
build on linux (i686 - auto)	4m 29s
build on linux (armv7 - auto)	2m 41s
build on linux (x86_64 - musllinux_1_1)	2m 41s
build on linux (aarch64 - musllinux_1_1)	2m 52s
build on linux (ppc64le - auto)	2m 29s
build on linux (s390x - auto)	2m 38s
Upload package to PyPi	13s
	38m 44s

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