message: Preparing metainfo.xml for post-release.
diff: <!-- unreleased: TODO: Don't forget to add date attribute to it. -->
  <!--
  +
  <release version="x.y.z" urgency="medium" type="development">
  <description>
  <ul>
  + <li> ... </li>
  </ul>
  </description>
  </release>
  +
  -->
  + <release version="x.y.z" urgency="medium" type="development">
  + <description>
  + <ul>
  + <li> ... </li>
  + </ul>
  + </description>
  + </release>
  +
  <release version="0.3.6" urgency="medium" date="2022-10-30">
  <description>
  <ul>
  