make change-history on non-master branches

[Glenn Morris]

Why does 'make change-history' refuse to run on non-master branches?
It's going to need to be run on the emacs-25 branch, isn't it?

And the resulting ChangeLog.2 entries (and more importantly, any
corrections) will have to be merged to master, just like in the old days?
(I presume gitmerge.el should handle it though.)

(It seems to me that it would be simpler if the corrections to commit
logs were versioned, not the whole generated ChangeLog; but I've said
that before.)