Add v6 to v8 draft link to README #1847

Job	Run time
Tests / OS: macos-latest - stable-x86_64-apple-darwin	1h 14m 37s
Tests / OS: ubuntu-latest - stable-x86_64-gnu	2m 3s
Tests / Stable	48s
Build / MSRV	40s
Tests / OS: windows-latest - stable-x86_64-gnu	3m 45s
Tests / Examples	17s
Tests / OS: windows-latest - stable-x86_64-msvc	4m 7s
Build / Clippy	22s
Tests / OS: macos-latest - beta-x86_64-apple-darwin	3m 0s
Build / Embedded	14s
Tests / Miri	1m 7s
Tests / OS: ubuntu-latest - beta-x86_64-gnu	1m 45s
Tests / OS: windows-latest - beta-x86_64-gnu	3m 49s
Tests / WebAssembly (WASI)	43s
Tests / OS: windows-latest - beta-x86_64-msvc	3m 6s
Tests / WebAssembly (wasm-bindgen)	1m 2s
Tests / OS: macos-latest - nightly-x86_64-apple-darwin	4m 43s
Build / No deps	1m 6s
Tests / OS: ubuntu-latest - nightly-x86_64-gnu	1m 51s
Tests / OS: windows-latest - nightly-x86_64-gnu	3m 34s
Tests / OS: windows-latest - nightly-x86_64-msvc	2m 54s
	1h 55m 33s

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