bump version to v0.2.1 and format #9

Job	Run time
plan	10s
build-local-artifacts (aarch64-pc-windows-msvc)	3m 30s
build-local-artifacts (aarch64-unknown-linux-gnu)	1m 54s
build-local-artifacts (x86_64-pc-windows-msvc)	2m 26s
build-local-artifacts (x86_64-apple-darwin)	1m 54s
build-local-artifacts (x86_64-unknown-linux-gnu)	1m 12s
build-local-artifacts (aarch64-apple-darwin)	1m 11s
build-global-artifacts	19s
host	23s
publish-homebrew-formula	44s
announce	6s
	13m 49s

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