update mailmap for Bastian Kauschke

Author: lcnr

.mailmap

@@ -29,6 +29,7 @@ Ariel Ben-Yehuda <arielb1@mail.tau.ac.il> Ariel Ben-Yehuda <ariel.byd@gmail.com>
 Ariel Ben-Yehuda <arielb1@mail.tau.ac.il> arielb1 <arielb1@mail.tau.ac.il>
 Austin Seipp <mad.one@gmail.com> <as@hacks.yi.org>
 Aydin Kim <ladinjin@hanmail.net> aydin.kim <aydin.kim@samsung.com>
+Bastian Kauschke <bastian_kauschke@hotmail.de>
 Barosl Lee <vcs@barosl.com> Barosl LEE <github@barosl.com>
 Ben Alpert <ben@benalpert.com> <spicyjalapeno@gmail.com>
 Ben Sago <ogham@users.noreply.github.com> Ben S <ogham@bsago.me>