Fixed syntax error in liquid date

_includes/post-list.html

@@ -2,7 +2,7 @@
   {% for post in site.posts %}
   <li>
     <a class="postlink">
-      <p id="date">{{ post.date | date: "%Y-%m-%d }}</p>
+      <p id="date">{{ post.date | date: "%Y-%m-%d" }}</p>
       <p id="title">{{ post.title }}</p>
     </a>
   </li>