Update copyright for 2015 updates.
diff --git a/Objects/setobject.c b/Objects/setobject.c
index 91f341c..f865d1c 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -4,7 +4,7 @@
    Written and maintained by Raymond D. Hettinger <python@rcn.com>
    Derived from Lib/sets.py and Objects/dictobject.c.
 
-   Copyright (c) 2003-2014 Python Software Foundation.
+   Copyright (c) 2003-2015 Python Software Foundation.
    All rights reserved.
 
    The basic lookup function used by all operations.