docs(roadmap): update ROADMAP post v1.0 (#3763) #2929

Job	Run time
semver	21s
Verify hyper.h is up to date	36s
Check Style	5s
Test stable on ubuntu-latest	1m 4s
Test C API (FFI)	15s
features	30s
Test stable on windows-latest	2m 42s
Test stable on macOS-latest	1m 1s
Test cargo-c support (FFI)	15s
minimal-versions	23s
Test beta on ubuntu-latest	1m 7s
Test with Miri	2m 26s
Test beta on windows-latest	1m 49s
Check MSRV	16s
udeps	22s
Test beta on macOS-latest	1m 4s
Test nightly on ubuntu-latest	1m 7s
Test nightly on windows-latest	2m 6s
Test nightly on macOS-latest	1m 19s
Check exposed types	14s
Build docs	20s
CI is green	1s
	19m 23s

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