Update copyright line to 2015
diff --git a/include/polarssl/pbkdf2.h b/include/polarssl/pbkdf2.h
index d30f054..3d95369 100644
--- a/include/polarssl/pbkdf2.h
+++ b/include/polarssl/pbkdf2.h
@@ -6,7 +6,7 @@
  *
  * \author Mathias Olsson <mathias@kompetensum.com>
  *
- *  Copyright (C) 2006-2012, ARM Limited, All Rights Reserved
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://polarssl.org)
  *