Release 0.3.31 #2856

Job	Run time
cargo +1.56 build	1m 6s
cargo +stable build	42s
cargo test (ubuntu-latest)	2m 48s
cargo +1.36 build (futures-{core, io, sink})	44s
cargo +beta build	44s
cargo test (macos-latest)	6m 35s
cargo bench	46s
cargo +nightly build	36s
cargo test (windows-latest)	4m 47s
cargo doc	19s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 33s
cargo hack check --feature-powerset	2m 41s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 33s
cargo fmt	6s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	7m 1s
cargo minimal-versions build	29s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 37s
cargo miri test	12m 38s
cargo build --target thumbv7m-none-eabi	25s
cargo build --target thumbv6m-none-eabi	25s
cargo test -Z sanitizer=address	3m 24s
cargo test -Z sanitizer=memory	5m 1s
cargo test -Z sanitizer=thread	2m 21s
	1h 8m 21s

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