Add Peter to the authors

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

AUTHORS

@@ -32,7 +32,7 @@ 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, Vic Lee, Christian Beier,
-and Alexander Dorokhine.
+Alexander Dorokhine and Peter Arrenbrecht.
 
 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