Update README.md: added hyper-util to the dependencies section #2371

Job	Run time
Verify hyper.h is up to date	28s
Check Style	13s
features	19s
minimal-versions	24s
Test with Miri	50s
Test C API (FFI)	24s
Check MSRV	22s
Test stable on ubuntu-latest	16s
udeps	23s
Test stable on windows-latest	22s
Test stable on macOS-latest	19s
Test beta on ubuntu-latest	22s
Test beta on windows-latest	19s
Test beta on macOS-latest	21s
Test nightly on ubuntu-latest	20s
Test nightly on windows-latest	21s
Test nightly on macOS-latest	20s
Build docs	0s
Check exposed types	0s
CI is green	0s
	6m 23s

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