add copyright

src/core/perfmodel/perfmodel_bus.c

@@ -2,6 +2,7 @@
  *
  * Copyright (C) 2009-2013  Université de Bordeaux 1
  * Copyright (C) 2010, 2011, 2012, 2013  Centre National de la Recherche Scientifique
+ * Copyright (C) 2013 Corentin Salingue
  *
  * StarPU is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by