fix mailmap

Author: steveklabnik

.mailmap

@@ -152,7 +152,7 @@ NAKASHIMA, Makoto <makoto.nksm+github@gmail.com>
 Nathan Wilson <wilnathan@gmail.com>
 Nathaniel Herman <nherman@post.harvard.edu> Nathaniel Herman <nherman@college.harvard.edu>
 Neil Pankey <npankey@gmail.com> <neil@wire.im>
-Nicole Mazzuca <npmazzuca@gmail.com> Nicole <npmazzuca@gmail.com>
+Nicole Mazzuca <npmazzuca@gmail.com>
 Nick Platt <platt.nicholas@gmail.com>
 Nif Ward <nif.ward@gmail.com>
 Oliver Schneider <oliver.schneider@kit.edu> oli-obk <github6541940@oli-obk.de>