Release 0.3.31 #2853

Job	Run time
cargo +1.56 build	1m 6s
cargo bench	48s
cargo +1.36 build (futures-{core, io, sink})	48s
cargo +stable build	1m 2s
cargo hack check --feature-powerset	2m 36s
cargo +beta build	39s
cargo +nightly build	35s
cargo miri test	3m 28s
cargo build --target thumbv7m-none-eabi	29s
cargo test -Z sanitizer=address	3m 29s
cargo test -Z sanitizer=memory	3m 30s
cargo test (ubuntu-latest)	2m 35s
cargo test (macos-latest)	3m 21s
cargo build --target thumbv6m-none-eabi	26s
cargo test -Z sanitizer=thread	2m 21s
cargo test (windows-latest)	3m 20s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 28s
cargo doc	20s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	3m 27s
cargo fmt	15s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	3m 28s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 27s
cargo minimal-versions build	24s
	45m 22s

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