chore: Prepare v0.6.1 release #49

Job	Run time
clippy	40s
rustfmt	13s
cross_platform_tests (ubuntu-latest, beta)	1m 19s
cross_platform_tests (ubuntu-latest, stable)	1m 4s
cross_platform_tests (macOS-latest, stable)	1m 6s
cross_platform_tests (ubuntu-latest, nightly)	1m 17s
cross_platform_tests (macOS-latest, nightly)	2m 8s
cross_platform_tests (windows-latest, stable)	2m 0s
cross_platform_tests (windows-latest, beta)	3m 9s
msrv	1m 4s
cross_platform_tests (macOS-latest, beta)	1m 41s
cross_platform_tests (windows-latest, nightly)	2m 52s
	18m 33s

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