docs(readme): update readme for 1.0 #2344

Job	Run time
Check Style	9s
Verify hyper.h is up to date	21s
Test with Miri	45s
Check MSRV	17s
Test C API (FFI)	16s
Test stable on ubuntu-latest	1m 13s
udeps	24s
features	17s
Test stable on windows-latest	3m 17s
Test stable on macOS-latest	2m 24s
Test beta on ubuntu-latest	1m 9s
Test beta on windows-latest	1m 42s
Test beta on macOS-latest	1m 45s
Test nightly on ubuntu-latest	1m 11s
Test nightly on windows-latest	2m 2s
Test nightly on macOS-latest	2m 0s
Build docs	13s
Check exposed types	19s
CI is green	1s
	19m 45s

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