Add Holger Wansing to THANKS

He has contributed considerably to the German translation of both dpkg
and the scripts in dpkg-dev.

THANKS

@@ -60,6 +60,7 @@ Hartmut Koptein <koptein@naffel.de>
 Heiko Schlittermann <heiko@lotte.sax.de>
 Helge Kreutzmann <debian@helgefjell.de>
 Hiroshi KISE <fuyuneko@ryukyu.ne.jp>
+Holger Wansing <linux@wansing-online.de>
 Ian Eure <ieure@debian.org>
 Ian Jackson <ian@chiark.greenend.org.uk>
 Ian Murdock <imurdock@debian.org>