Update to version `v0.21.0` #34

Job	Run time
macos (x86_64-apple-darwin)	2m 26s
install-cross (linux-musl)	7s
macos (aarch64-apple-darwin)	2m 11s
windows (i686-pc-windows-msvc)	4m 10s
linux (aarch64-unknown-linux-gnu)	1m 46s
windows (x86_64-pc-windows-msvc)	3m 43s
linux (aarch64-unknown-linux-musl)	1m 46s
linux (arm-unknown-linux-gnueabi)	1m 44s
linux (arm-unknown-linux-gnueabihf)	1m 58s
linux (armv7-unknown-linux-gnueabihf)	1m 44s
linux (i686-unknown-linux-musl)	1m 52s
linux (x86_64-unknown-linux-musl)	1m 45s
Build Docker image for tagged release	21m 29s
	46m 41s

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