cmov

update README to reflect true `cmov` MSRV (#965) #484

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	1m 27s
build (1.60.0, wasm32-unknown-unknown)	1m 27s
build (stable, thumbv7em-none-eabi)	16s
cross (aarch64-unknown-linux-gnu, 1.60.0)	1m 54s
build (stable, wasm32-unknown-unknown)	18s
cross (aarch64-unknown-linux-gnu, stable)	36s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 7s
cross (powerpc-unknown-linux-gnu, stable)	34s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	1m 46s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 22s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	1m 41s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	2m 22s
minimal-versions / minimal-versions	21s
	16m 11s

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