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Add `send` feature flag #71

Job	Run time
format	2m 25s
check-minimal	5m 20s
doc	58s
check	3m 0s
test (stable, --no-default-features)	20s
test (stable, --no-default-features --features "mio06")	19s
test (stable, --no-default-features --features "mio07")	17s
test (stable, --no-default-features --features "mio08")	20s
test (stable, --no-default-features --features "mio10")	23s
test (stable, --no-default-features --features "hwdb")	24s
test (stable)	18s
test (beta, --no-default-features)	28s
test (beta, --no-default-features --features "mio06")	47s
test (beta, --no-default-features --features "mio07")	38s
test (beta, --no-default-features --features "mio08")	19s
test (beta, --no-default-features --features "mio10")	18s
test (beta, --no-default-features --features "hwdb")	19s
test (beta)	17s
test (nightly, --no-default-features)	21s
test (nightly, --no-default-features --features "mio06")	17s
test (nightly, --no-default-features --features "mio07")	16s
test (nightly, --no-default-features --features "mio08")	19s
test (nightly, --no-default-features --features "mio10")	25s
test (nightly, --no-default-features --features "hwdb")	27s
test (nightly)	25s
publish	0s
	19m 40s

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