add myself to the mailmap

Author: dakkar

.mailmap

@@ -318,6 +318,7 @@ Geoffrey T. Dairiki <dairiki@dairiki.org> Geoffrey T. Dairiki <dairiki at dairik
 George Greer <perl@greerga.m-l.org> George Greer <greerga@m-l.org>
 Gerard Goossen <gerard@ggoossen.net> Gerard Goossen <gerard@tty.nl>
 Gerrit P. Haase <gp@familiehaase.de> <gerrit@familiehaase.de>
+Gianni Ceccarelli <dakkar@thenautilus.net> dakkar <dakkar@thenautilus.net>
 Gianni Ceccarelli <dakkar@thenautilus.net> Gianni Ceccarelli <gceccarelli@veritone.com>
 Gideon Israel Dsouza <gideon@cpan.org> <gideon@cpan.org>
 Gideon Israel Dsouza <gideon@cpan.org> Gideon Israel Dsouza <gidisrael@gmail.com>