Fix formatting

Closes #6

_layouts/tag_page.html

@@ -5,7 +5,7 @@ layout: default
 <ul>
 {% for post in site.tags[page.tag] %}
     <li>
-      <a href="{{ post.url }}">{{ post.title }}</a> ({{ post.date | date_to_string }}
+      <a href="{{ post.url }}">{{ post.title }}</a> ({{ post.date | date_to_string }})
     </li>
 {% endfor %}
 </ul>