Add Christian Beier to the AUTHORS

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

AUTHORS

@@ -31,7 +31,7 @@ Mark McLoughlin, Paul Fox, Juan Jose Costello, Andre Leiadella,
 Alberto Lusiani, Malvina Mazin, Dave Stuart, Rohit Kumar, Donald Dugger,
 Steven Carr, Uwe Völker, Charles Coffing, Guillaume Rousse,
 Alessandro Praduroux, Brad Hards, Timo Ketola, Christian Ehrlicher,
-Noriaki Yamazaki, Ben Klopfenstein, and Vic Lee.
+Noriaki Yamazaki, Ben Klopfenstein, Vic Lee, and Christian Beier.
 
 Probably I forgot quite a few people sending a patch here and there, which
 really made a difference. Without those, some obscure bugs still would