md2

sha3: bump `keccak` dependency to v0.2.0-pre.0 (#550) #921

Job	Run time
set-msrv / set-msrv	2s
minimal-versions / minimal-versions	41s
test (1.71.0)	46s
build (1.71.0, thumbv7em-none-eabi)	23s
test (stable)	42s
build (1.71.0, wasm32-unknown-unknown)	1m 13s
build (stable, thumbv7em-none-eabi)	14s
build (stable, wasm32-unknown-unknown)	13s
	4m 14s

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