fix changes.html

Installation/changes.html

@@ -234,10 +234,9 @@ and <code>src/</code> directories).
       a graph adaptor which allows to create virtual borders when marking edges
       as seam edges.
     </li>
-  </ul>
      <li>Add the functions <code>read_off()</code> and <code>write_off()</code>. 
     </li>
-</ul>
+  </ul>
 
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