check

docs(readme): add crate downloads badge #356

Job	Run time
Formatting	7s
Check minimal supported rust version (MSRV).	2m 38s
Clippy (stable)	19s
Build and test (ubuntu, stable)	50s
Clippy (beta)	26s
Build and test (ubuntu, beta)	43s
Clippy (nightly)	29s
Build and test (ubuntu, nightly)	1m 3s
Build and test (macos, stable)	49s
Build and test (macos, beta)	1m 15s
Build and test (macos, nightly)	1m 28s
Build and test (windows, stable)	1m 59s
Build and test (windows, beta)	1m 32s
Build and test (windows, nightly)	2m 40s
	16m 18s

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