link to epub from html

simple.html

@@ -104,7 +104,9 @@ $if(title)$
     $if(hash)$&mdash;<code>$hash$</code>$endif$
     </p>
     $endif$
-    <p class="lead"><a href="nafems4.pdf" target="_blank">PDF version</a></p>
+    <p class="lead"><a href="nafems4.pdf" target="_blank">PDF</a></p>
+    |
+    <p class="lead"><a href="nafems4.epub" target="_blank">EPUB</a></p>
     $if(abstract)$
     <h3 class="text-center">Abstract</h3>
     <p class="text-justify">$abstract$</p>