M-x add-release-logs

[Glenn Morris]

add-release-logs in admin.el adds "Version X.Y released" to every single
ChangeLog in Emacs (except the one in lisp/gnus, I imagine due to
hysterical raisins that have not been carried over to Cedet, Org, etc).
There are quite a few ChangeLogs now. Doing this seems a bit of pain.
IMO, it would be simpler to just put it in the top-level ChangeLog.
Any objections?

(This information is less useful than it was, due to branching.
"Version 24.2 released" does not appear anywhere in the current emacs-24
ChangeLogs, for example, because that release came from a different
branch. There is no point in the emacs-24 ChangeLogs that corresponds to
24.2.)