fix: changelog typo: must not => must now #2829

Job	Run time
Check Style	4s
Verify hyper.h is up to date	4m 36s
semver	15s
Test with Miri	21m 4s
features	41s
minimal-versions	24s
Test C API (FFI)	1m 14s
Check MSRV	4m 26s
Test stable on ubuntu-latest	1m 51s
udeps	38s
Test stable on windows-latest	2m 14s
Test stable on macOS-latest	1m 7s
Test beta on ubuntu-latest	1m 18s
Test beta on windows-latest	2m 16s
Test beta on macOS-latest	1m 53s
Test nightly on ubuntu-latest	5m 7s
Test nightly on windows-latest	2m 24s
Test nightly on macOS-latest	1m 32s
Check exposed types	19s
Build docs	24s
CI is green	1s
	53m 48s

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