lib/sitemap.xml in jekyll-sitemap-0.3.0 vs lib/sitemap.xml in jekyll-sitemap-0.4.0

@@ -14,13 +14,13 @@
     <lastmod>{{ site.time | date_to_xmlschema }}</lastmod>
     <changefreq>weekly</changefreq>
     <priority>{% if post.url == "/" or post.url == "/index.html" %}1.0{% else %}0.7{% endif %}</priority>
   </url>
   {% endfor %}
-  {% for file in site.static_files %}
+  {% for file in site.html_files %}
   <url>
     <loc>{{ site_url }}{{ file.path }}</loc>
-    <lastmod>{{ file.modified_time | date_to_xmlschema }}</lastmod>
+    <lastmod>{{ file.modified_time | date:"%Y-%m-%dT%H:%M:%sZ" }}</lastmod>
     <priority>0.6</priority>
   </url>
   {% endfor %}
 </urlset>