CHANGELOG.md: missing infos about, e.g., 1.2.1

[goto40]

I am missing the CHANGELOG for current versions? Is it maintained elsewhere? I checked https://github.com/langium/langium/blob/main/CHANGELOG.md

[spoenemann]

@msujew could you add that as well when you work on the v2.0.0 changelogs?

[msujew]

@goto40 Langium 1.2.1 only contained a minor bugfix that we needed in one of our projects, see #1043.