Move feed footer to an include

_includes/feed-footer.html

@@ -0,0 +1 @@
+<p><a href="{{ site.url }}{{ post.url }}">{{ post.title | xml_escape }}</a> was originally published by {{ site.owner.name }} at <a href="{{ site.url }}">{{ site.title }}</a> on {{ post.date | date: "%B %d, %Y" }}.</p>

feed.xml

@@ -33,8 +33,10 @@ sitemap: false
     <uri>{{ site.url }}</uri>
     {% if author.email %}<email>{{ author.email }}</email>{% endif %}
   </author>
-  <content type="html">{{ post.content | xml_escape }}
+  <content type="html">
-  &lt;p&gt;&lt;a href=&quot;{{ site.url }}{{ post.url }}&quot;&gt;{{ post.title }}&lt;/a&gt; was originally published by {{ author.name }} at &lt;a href=&quot;{{ site.url }}&quot;&gt;{{ site.title }}&lt;/a&gt; on {{ post.date | date: "%B %d, %Y" }}.&lt;/p&gt;</content>
+    {{ post.content | xml_escape }}
+    {% include feed-footer.html %}
+  </content>
 </entry>
 {% endfor %}
 </feed>