I've done this process enough times that I should have written a script
to do it a while ago. This one is rough, but the whole changelog process
is pretty rough.
This script takes multiple revision ranges and produces something that
looks like a rough untranslated changelog, with indicators for how many
of the provided ranges had the same change (deduplicated by title.)
I use a process like this to build the Stable and Preview release notes
out of a set of revision ranges.
