Release 0.3.31 #2857

Job	Run time
cargo +1.36 build (futures-{core, io, sink})	1m 3s
cargo +stable build	35s
cargo test (ubuntu-latest)	2m 51s
cargo +beta build	40s
cargo bench	50s
cargo test (macos-latest)	6m 2s
cargo +nightly build	34s
cargo doc	19s
cargo test (windows-latest)	4m 48s
cargo hack check --feature-powerset	2m 41s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 42s
cargo fmt	7s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 36s
cargo minimal-versions build	25s
cargo miri test	12m 21s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 53s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 33s
cargo build --target thumbv7m-none-eabi	27s
cargo test -Z sanitizer=address	3m 13s
cargo +1.56 build	1m 9s
cargo build --target thumbv6m-none-eabi	24s
cargo test -Z sanitizer=memory	4m 52s
cargo test -Z sanitizer=thread	2m 22s
	1h 6m 27s

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