[bug fix] show posts in feed.xml

feed.xml

@@ -10,7 +10,12 @@ layout: null
     <link>{{ site.baseurl | prepend: site.url }}/</link>
     <description>{{ site.description | xml_escape }}</description>
     <pubDate>{{ site.time | date_to_rfc822 }}</pubDate>
-    {% assign posts = site.posts | where: 'hide', null %}
+    {% assign posts = '' | split: '' %}
+    {% for post in site.posts %}
+    {% if post.hide != true %}
+    {% assign posts = posts | push: post %}
+    {% endif %}
+    {% endfor %}
     {% for post in posts limit:15 %}
       {% include page-url-resolver.html page=post %}
       <item>