Lint

Add experimental async-io windows support #49

Job	Run time
lint (macos-latest, --all-features, --cfg mfio_assume_linear_types --cfg tokio_unstable)	1m 48s
lint (macos-latest, --all-features, --cfg tokio_unstable)	2m 3s
lint (macos-latest, --cfg mfio_assume_linear_types --cfg tokio_unstable)	1m 13s
lint (macos-latest, --cfg tokio_unstable)	1m 13s
lint (ubuntu-latest, --all-features, --cfg mfio_assume_linear_types --cfg tokio_unstable)	48s
lint (ubuntu-latest, --all-features, --cfg tokio_unstable)	50s
lint (ubuntu-latest, --cfg mfio_assume_linear_types --cfg tokio_unstable)	57s
lint (ubuntu-latest, --cfg tokio_unstable)	53s
lint (windows-latest, --all-features, --cfg mfio_assume_linear_types --cfg tokio_unstable)	3m 22s
lint (windows-latest, --all-features, --cfg tokio_unstable)	2m 20s
lint (windows-latest, --cfg mfio_assume_linear_types --cfg tokio_unstable)	2m 3s
lint (windows-latest, --cfg tokio_unstable)	3m 18s
	20m 48s

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