add since

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@515621 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/resources.html

@@ -776,7 +776,7 @@ larger collection.</p>
 <p>Includes the last <i>count</i> resources from a nested resource collection.
 This can be used in conjunction with the <a href="#sort">sort</a> collection,
 for example, to select the last few oldest, largest, etc. resources from a
-larger collection.</p>
+larger collection. <strong>Since Ant 1.7.1</strong>.</p>
 <blockquote>
   <table border="1" cellpadding="2" cellspacing="0">
     <tr>