Fix copyright notice

src/Config.h.in

@@ -1,6 +1,5 @@
 /*
 Copyright (c) 2013 Daniele Bartolini, Michele Rossi
-Copyright (c) 2013 Daniele Bartolini, Michele Rossi
 Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto
 
 Permission is hereby granted, free of charge, to any person