Release 0.3.29 #2339

Job	Run time
cargo +1.56 build	2m 44s
codegen	41s
cargo bench	2m 23s
cargo +stable build	55s
cargo +1.36 build (futures-{core, io, sink})	4m 41s
cargo +beta build	1m 30s
cargo +nightly build	1m 1s
cargo hack check --feature-powerset	5m 38s
cargo minimal-versions build	46s
cargo miri test	15m 12s
cargo build --target thumbv7m-none-eabi	38s
cargo test (ubuntu-latest)	4m 34s
cargo build --target thumbv6m-none-eabi	37s
cargo doc	28s
cargo test (macos-latest)	5m 29s
cargo fmt	8s
cargo test (windows-latest)	7m 0s
cargo test -Z sanitizer=address	4m 13s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	5m 39s
cargo test -Z sanitizer=memory	3m 28s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	10m 34s
cargo test -Z sanitizer=thread	3m 43s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	10m 42s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 46s
	1h 37m 30s

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