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Add `sync` feature flag #76

Job	Run time
doc	22s
check	2m 40s
check-minimal	4m 43s
format	2m 27s
test (stable, --no-default-features)	17s
test (stable, --no-default-features --features "mio06")	20s
test (stable, --no-default-features --features "mio07")	19s
test (stable, --no-default-features --features "mio08")	18s
test (stable, --no-default-features --features "mio10")	23s
test (stable, --no-default-features --features "hwdb")	18s
test (stable)	23s
test (beta, --no-default-features)	19s
test (beta, --no-default-features --features "mio06")	19s
test (beta, --no-default-features --features "mio07")	33s
test (beta, --no-default-features --features "mio08")	31s
test (beta, --no-default-features --features "mio10")	20s
test (beta, --no-default-features --features "hwdb")	17s
test (beta)	20s
test (nightly, --no-default-features)	19s
test (nightly, --no-default-features --features "mio06")	28s
test (nightly, --no-default-features --features "mio07")	19s
test (nightly, --no-default-features --features "mio08")	18s
test (nightly, --no-default-features --features "mio10")	29s
test (nightly, --no-default-features --features "hwdb")	23s
test (nightly)	17s
publish	0s
	17m 42s

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