Fix mailmap duplicates, Carol and Brian.

.mailmap

@@ -41,11 +41,12 @@ Boris Egorov <jightuse@gmail.com> <egorov@linux.com>
 Brandon Sanderson <singingboyo@gmail.com> Brandon Sanderson <singingboyo@hotmail.com>
 Brett Cannon <brett@python.org> Brett Cannon <brettcannon@users.noreply.github.com>
 Brian Anderson <banderson@mozilla.com> <andersrb@gmail.com>
+Brian Anderson <banderson@mozilla.com> <banderson@mozilla.org>
 Brian Dawn <brian.t.dawn@gmail.com>
 Brian Leibig <brian@brianleibig.com> Brian Leibig <brian.leibig@gmail.com>
 Carl-Anton Ingmarsson <mail@carlanton.se> <ca.ingmarsson@gmail.com>
-Carol (Nichols || Goulding) <carol.nichols@gmail.com>
-Carol (Nichols || Goulding) <cnichols@thinkthroughmath.com>
+Carol (Nichols || Goulding) <carol.nichols@gmail.com> <cnichols@thinkthroughmath.com>
+Carol (Nichols || Goulding) <carol.nichols@gmail.com> Carol Nichols <carol.nichols@gmail.com>
 Carol Willing <carolcode@willingconsulting.com>
 Chris C Cerami <chrisccerami@users.noreply.github.com> Chris C Cerami <chrisccerami@gmail.com>
 Chris Pressey <cpressey@gmail.com>