Only include posts past a feed epoch to prevent spamming planets, etc.

_config.yml

@@ -5,4 +5,6 @@ url: https://diffoscope.org
 baseurl: /
 permalink: /news/:title/
 
+feed_epoch: 2020-05-20T00:00:00Z
+
 salsa_url: https://salsa.debian.org/reproducible-builds/diffoscope

feed.xml

@@ -11,13 +11,15 @@ layout: null
     <pubDate>{{ site.time | date_to_rfc822 }}</pubDate>
     <lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
     {% for post in site.posts limit:10 %}
+    {% if post.date > site.feed_epoch %}
       <item>
-        <title>{{ post.title | xml_escape }}</title>
+        <title>{{ timestamp }}{{ post.title | xml_escape }}</title>
         <description>{{ post.content | xml_escape }}</description>
         <pubDate>{{ post.date | date_to_rfc822 }}</pubDate>
         <link>{{ post.url | absolute_url }}</link>
         <guid isPermaLink="true">{{ post.url | absolute_url }}</guid>
       </item>
+    {% endif %}
     {% endfor %}
   </channel>
 </rss>