multiboot2-header: talk about yanked versions in CHANGELOG.md #1068

Job	Run time
build (msrv) / rust	18s
build (stable) / rust	15s
build (nightly) / rust	30s
style (stable) / rust	21s
build no_std (stable) / rust	12s
build no_std (stable) [w/o builder] / rust	14s
build no_std (stable) [Windows] / rust	1m 30s
style (msrv) / rust	24s
build no_std (msrv) / rust	20s
build no_std (nightly) / rust	25s
tests with miri (nightly) / rust	1m 43s
style (nightly) / rust	32s
	6m 44s

Provide feedback