Update copyright end date.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/project/trunk@1771547 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/NOTICE.txt b/NOTICE.txt
index c8bb0e0..d10f58e 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache HttpComponents
-Copyright 2006-2014 The Apache Software Foundation
+Copyright 2006-2016 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).