Update copyright line to 2015
diff --git a/programs/random/gen_entropy.c b/programs/random/gen_entropy.c
index 4d7dac8..88d03a3 100644
--- a/programs/random/gen_entropy.c
+++ b/programs/random/gen_entropy.c
@@ -1,7 +1,7 @@
 /**
  *  \brief Use and generate multiple entropies calls into a file
  *
- *  Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://polarssl.org)
  *