bump to v0.2.0 + update README #2

Job	Run time
build (aarch64-unknown-linux-gnu, ubuntu-latest, mhrv-rs-linux-arm64)	2m 10s
build (x86_64-unknown-linux-gnu, ubuntu-latest, mhrv-rs-linux-amd64)	1m 43s
build (x86_64-apple-darwin, macos-latest, mhrv-rs-macos-amd64)	1m 49s
build (x86_64-pc-windows-gnu, windows-latest, mhrv-rs-windows-amd64)	4m 55s
build (aarch64-apple-darwin, macos-latest, mhrv-rs-macos-arm64)	1m 37s
release	14s
	12m 28s

Provide feedback