Added notes to README to clarify version compatibility #183

Job	Run time
cargo check	30s
cargo check (feature combinations)	14s
cargo fmt	5s
cargo check (+MSRV -Zminimal-versions) (1.65.0)	1m 23s
cargo test (stable on ubuntu-latest)	54s
cargo check (+MSRV -Zminimal-versions) (stable)	22s
cargo test (beta on ubuntu-latest)	57s
build tests (wasm32-unknown-unknown)	50s
warnings	35s
cargo test (nightly on ubuntu-latest)	55s
build tests (wasm32-wasi)	55s
cargo test (stable on windows-latest)	2m 11s
cargo test (stable on macos-latest)	50s
all systems go!	1s
	10m 42s

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