Added Since to the description for the "negate" attribute.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276591 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/propertyset.html

@@ -27,10 +27,11 @@ supports this.</p>
   </tr>
   <tr>
     <td valign="top">negate</td>
-    <td valign="top">Whether to negate results.  If
+    <td valign="top">Whether to negate results. If
       &quot;<code>true</code>&quot;, all properties <i>not</i>
-      selected by nested elements will be returned.
-      Default is &quot;<code>false</code>&quot;.</td>
+      selected by nested elements will be returned. Default is
+      &quot;<code>false</code>&quot;. <em>Since Ant 1.6.2</em>
+    </td>
     <td valign="top" align="center">No</td>
   </tr>
 </table>