Just-Read: Update disqus link to protocol-relative

Just-Read/templates/article.html

@@ -18,7 +18,7 @@
 			       var disqus_identifier = "{{ article.url }}";
 			       (function() {
 			       var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
-			       dsq.src = 'http://{{ DISQUS_SITENAME }}.disqus.com/embed.js';
+			       dsq.src = '//{{ DISQUS_SITENAME }}.disqus.com/embed.js';
 			       (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
 			      })();
 			    </script>
@@ -29,4 +29,4 @@
 	{% include 'metadata.html' %}
 	</article>	
 </div>
-{% endblock %}
+{% endblock %}