Release 0.3.30 #2442

Job	Run time
cargo +1.56 build	1m 4s
cargo +1.36 build (futures-{core, io, sink})	1m 2s
cargo bench	53s
cargo +stable build	50s
cargo hack check --feature-powerset	2m 38s
cargo minimal-versions build	31s
cargo +beta build	42s
cargo +nightly build	42s
cargo miri test	8m 32s
cargo build --target thumbv7m-none-eabi	27s
cargo test (ubuntu-latest)	3m 4s
cargo build --target thumbv6m-none-eabi	27s
cargo test (macos-latest)	5m 1s
cargo doc	18s
cargo test (windows-latest)	5m 6s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 8s
cargo fmt	5s
cargo test -Z sanitizer=address	5m 24s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 31s
cargo test -Z sanitizer=memory	4m 7s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 52s
cargo test -Z sanitizer=thread	2m 59s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 31s
	1h 3m 54s

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