Update README.md: added hyper-util to the dependencies section #2370

Job	Run time
Check Style	12s
Verify hyper.h is up to date	24s
Test with Miri	1m 7s
Test C API (FFI)	27s
features	21s
minimal-versions	24s
Check MSRV	23s
Test stable on ubuntu-latest	1m 8s
udeps	30s
Test stable on windows-latest	1m 52s
Test stable on macOS-latest	1m 47s
Test beta on ubuntu-latest	1m 15s
Test beta on windows-latest	1m 45s
Test beta on macOS-latest	1m 32s
Test nightly on ubuntu-latest	1m 35s
Test nightly on windows-latest	2m 36s
Test nightly on macOS-latest	3m 16s
Check exposed types	14s
Build docs	24s
CI is green	1s
	21m 13s

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