Release 0.3.31 #2849

Job	Run time
cargo doc	16s
cargo bench	18s
cargo +1.36 build (futures-{core, io, sink})	46s
cargo +stable build	13s
cargo +beta build	16s
cargo hack check --feature-powerset	21s
cargo fmt	14s
cargo +nightly build	17s
cargo minimal-versions build	17s
cargo miri test	37s
cargo build --target thumbv7m-none-eabi	27s
cargo build --target thumbv6m-none-eabi	27s
cargo test (ubuntu-latest)	17s
cargo test -Z sanitizer=address	36s
cargo +1.56 build	36s
cargo test (macos-latest)	21s
cargo test -Z sanitizer=memory	35s
cargo test (windows-latest)	40s
cargo test -Z sanitizer=thread	35s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	1m 19s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	46s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	56s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	45s
	11m 55s

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