rc4

chacha20 v0.10.0 (#534) #480

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	22s
test (stable)	19s
build (1.85.0, thumbv7em-none-eabi)	19s
test (1.85.0)	19s
minimal-versions / minimal-versions	30s
build (stable, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	16s
	2m 27s

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