Merge pull request mmistakes#20 from sam-at-github/patch-1

Update post-comments.html

_includes/post-comments.html

@@ -8,7 +8,7 @@
 
     (function() {
         var d = document, s = d.createElement('script');
-        s.src = '//alembic-1.disqus.com/embed.js';
+        s.src = '//{{ site.disqus }}.disqus.com/embed.js';
         s.setAttribute('data-timestamp', +new Date());
         (d.head || d.body).appendChild(s);
     })();