Update copyright for 2016 in NOTICE.txt

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/ognl/trunk@1725440 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/NOTICE.txt b/NOTICE.txt
index d6f7529..1c4d679 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons OGNL
-Copyright 2001-2013 The Apache Software Foundation
+Copyright 2001-2016 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).