cleanup mailmap

Author: mickeyn

.mailmap

@@ -28,7 +28,6 @@ Michael Peters <mpeters@plusthree.com>
 Michael Peters <mpeters@plusthree.com> <mpeters@spike.(none)>
 Michiel Beijen <michiel.beijen@gmail.com> <michiel.beijen@otrs.com>
 Mickey Nasriachi <mickey@cpan.org>
-Mickey Nasriachi <mickey@cpan.org> <micha.nasriachi@booking.com>
 Mickey Nasriachi <mickey@cpan.org> <mickey75@gmail.com>
 Moritz Onken <onken@netcubed.de>
 Nicolas R <atoomic@cpan.org> <cpan@atoomic.org>