add support for utteranc.es (#205)

Shreyansh Khajanchi

21.03.2019 9b47893b348c4c3f45b102d5c3b556da8336031e

 layouts/posts/single.html

@@ -34,6 +34,7 @@
        {{ partial "posts/series.html" . }}
        {{ partial "posts/disqus.html" . }}
        {{ partial "posts/commento.html" . }}
        {{ partial "posts/utteranc.html" . }}
      </footer>
    </article>