Update ISSN footer.html

Author: hdlabconicet

_includes/footer.html

@@ -56,11 +56,12 @@ <h2 class="h4"><a href="{{ '/' | relative_url }}" class="text-white">{{ site.tit
                 <img src="{{ '/assets/img/Cc-by-nc-sa_chico.png' | relative_url }}" class="img-fluid" alt="Licencia Creative Commons" >
             </a>
 <br/><br/>
-            <p class="text-white">Enlace permanente: <a href="https://n2t.net/ark:/69774/cdb2024">https://n2t.net/ark:/69774/cdb2024</a></p>  
+            <p class="text-white">Enlace permanente: <a href="https://n2t.net/ark:/69774/cdb2024">https://n2t.net/ark:/69774/cdb2024</a>
+        </br>Biblioteca digital. ISSN 3072-7715</p>  
 
         </small>
     </div>
     <div class="col-md-12 text-center pt-3 pb-1">
 
     </div>
-</footer>
+</footer>