AUTHORS: Add Pelle Nilsson

AUTHORS

@@ -65,6 +65,7 @@ Olivier Gay <olivier.gay@a3.epfl.ch>
 Paul Sheppard <shepsoft@gmail.com>
 Paul Wouters <pwouters@redhat.com>
 Pavel Semjanov <pavel@semjanov.com>
+Pelle Nilsson <per.nilsson@xelmo.com>
 Peter Stuge <peter@stuge.se>
 Phateus <Jesse.Moll@gmail.com>
 Philip Kaufmann <phil.kaufmann@t-online.de>