Release 0.3.31 #2855

Job	Run time
cargo minimal-versions build	35s
cargo +1.36 build (futures-{core, io, sink})	44s
cargo test (ubuntu-latest)	58s
cargo +stable build	36s
cargo test (macos-latest)	1m 0s
cargo +beta build	40s
cargo +1.56 build	47s
cargo bench	44s
cargo test (windows-latest)	50s
cargo +nightly build	34s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	57s
cargo doc	18s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	57s
cargo hack check --feature-powerset	57s
cargo fmt	5s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	57s
cargo miri test	59s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	57s
cargo build --target thumbv7m-none-eabi	27s
cargo test -Z sanitizer=address	57s
cargo build --target thumbv6m-none-eabi	25s
cargo test -Z sanitizer=memory	58s
cargo test -Z sanitizer=thread	57s
	17m 19s

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