scripts/generate-CHANGES.py: fix capture group in gitMailmapLookup's contact regexp.
scripts/generate-CHANGES.py: fix capture group in gitMailmapLookup's contact regexp.

The email capture group accidently captured
the whole email part of the contact, including
angle brackets.

Update the capture group to only capture the
actual email address.

LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,Lartza/mumble,SuperNascher/mumble,SuperNascher/mumble,SuperNascher/mumble,Lartza/mumble,Lartza/mumble,LuAPi/mumble,LuAPi/mumble,Lartza/mumble,LuAPi/mumble,SuperNascher/mumble,LuAPi/mumble,LuAPi/mumble,SuperNascher/mumble,SuperNascher/mumble,LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,Lartza/mumble,Lartza/mumble,LuAPi/mumble,LuAPi/mumble,SuperNascher/mumble