correct endif syntax

index.html

@@ -12,7 +12,7 @@ layout: default
             <a class="post-link" href="{{ post.url | prepend: site.baseurl }}">{{ post.title }}</a>
         </h2>
         <p class="date">
-            {{ post.date | date: "%b %-d, %Y" }} {% if post.post_author %} - {{ post.post_author }} {{%endif%}}
+            {{ post.date | date: "%b %-d, %Y" }} {% if post.post_author %} - {{ post.post_author }} {%endif%}
         </p>
         {{ post.content }}
     </div>