Release 0.3.31 #2852

Job	Run time
cargo +1.36 build (futures-{core, io, sink})	47s
cargo bench	22s
cargo hack check --feature-powerset	2m 24s
cargo +stable build	17s
cargo minimal-versions build	30s
cargo +beta build	25s
cargo miri test	33s
cargo build --target thumbv7m-none-eabi	25s
cargo +nightly build	23s
cargo build --target thumbv6m-none-eabi	31s
cargo test (ubuntu-latest)	25s
cargo +1.56 build	1m 2s
cargo test (macos-latest)	19s
cargo test (windows-latest)	45s
cargo doc	24s
cargo fmt	5s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	42s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	2m 1s
cargo test -Z sanitizer=address	38s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	49s
cargo test -Z sanitizer=memory	37s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	34s
cargo test -Z sanitizer=thread	38s
	15m 36s

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