Add note on version of beanshell required for ant 1.6

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275707 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/install.html

@@ -363,7 +363,10 @@ Installing Ant / Optional Tasks</a> section above.</p>
   </tr>
   <tr>
     <td>BeanShell JAR(s)</td>
-    <td>BeanShell with script task</td>
+    <td>BeanShell with script task.
+      <br/>
+    <strong>Note</strong>: Ant 1.6 and later require BeanShell version 1.3 or
+      later</td>
     <td><a href="http://www.beanshell.org/" target="_top">http://www.beanshell.org/</a></td>
   </tr>
   <tr>