placement.html in kramdown-2.3.1

- old
+ new

@@ -4,8 +4,8 @@
       <p>Footnote \` text&#160;<a href="#fnref:1" class="reversefootnote" role="doc-backlink">&#8617;</a></p>
     </li>
   </ol>
 </div>
 
-<p>Some para with a<sup id="fnref:1" role="doc-noteref"><a href="#fn:1" class="footnote">1</a></sup> footnote.</p>
+<p>Some para with a<sup id="fnref:1" role="doc-noteref"><a href="#fn:1" class="footnote" rel="footnote">1</a></sup> footnote.</p>
 
 <p>And another para.</p>