Update copyright dates, to include 2015.  No functional change.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15577 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/helgrind.h b/helgrind/helgrind.h
index acfd97a..d194c44 100644
--- a/helgrind/helgrind.h
+++ b/helgrind/helgrind.h
@@ -11,7 +11,7 @@
    This file is part of Helgrind, a Valgrind tool for detecting errors
    in threaded programs.
 
-   Copyright (C) 2007-2013 OpenWorks LLP
+   Copyright (C) 2007-2015 OpenWorks LLP
       info@open-works.co.uk
 
    Redistribution and use in source and binary forms, with or without