cpufeatures: add mentions of `avx512vbmi` and `avx512vbmi2` to readme… #413

Job	Run time
aarch64 (aarch64-unknown-linux-gnu, 1.60.0)	3m 10s
aarch64 (aarch64-unknown-linux-gnu, stable)	1m 26s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 49s
cross (powerpc-unknown-linux-gnu, stable)	1m 6s
build (1.60.0, armv7a-none-eabi)	2m 23s
build (1.60.0, thumbv7em-none-eabi)	2m 22s
build (1.60.0, wasm32-unknown-unknown)	2m 17s
build (stable, armv7a-none-eabi)	21s
build (stable, thumbv7em-none-eabi)	30s
build (stable, wasm32-unknown-unknown)	22s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	3m 15s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	1m 2s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	2m 38s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	27s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	4m 18s
test (x86_64-apple-darwin, macos-latest, stable)	46s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	6m 1s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 27s
minimal-versions / minimal-versions	1m 13s
	37m 53s

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