Add reference to Ant-Contrib project.

notice.txt

@@ -6,10 +6,13 @@
 
    This product includes software developed by the Spring Framework
    Project (http://www.springframework.org).
-   
+
    This product includes software developed by
    the Apache Software Foundation (http://www.apache.org).
-   
+
+   This product includes software developed by the
+   Ant-Contrib project (http://sourceforge.net/projects/ant-contrib).
+
    The end-user documentation included with a redistribution, if any,
    must include the following acknowledgement:
 
@@ -23,4 +26,3 @@
    for Spring" must not be used to endorse or promote products derived
    from this software without prior written permission. For written
    permission, please contact ben.alex@acegi.com.au.
-