Update footer.html

Author: rominicky

_includes/footer.html

@@ -25,6 +25,7 @@
     <span> 
       <ul>
         <li class="no_bullet">{{ site.time | date: '%Y' }} {{ site.title | escape }}. <a href="https://n2t.net/ark:/69774/hda2015">https://n2t.net/ark:/69774/hda2015</a></li>
+        <li class="no_bullet">Biblioteca digital ISSN 3072-7715</li>
         <li class="no_bullet">CC BY 4.0</li>
         <li class="no_bullet">Marcelo T. de Alvear 1694 – Buenos Aires (CABA) – Argentina</li>
         <li class="no_bullet">secrit@conicet.gov.ar / hdlabconicet@gmail.com</li>