src/core/disk.c: add copyright

src/core/disk.c

@@ -1,6 +1,7 @@
 /* StarPU --- Runtime system for heterogeneous multicore architectures.
  *
- * Copyright (C) 2013 Corentin Salingue
+ * Copyright (C) 2013  Corentin Salingue
+ * Copyright (C) 2015  CNRS
  *
  * 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