message: fix appdata otherwise appdata check on flathub fails: flatpak run --env=G_DEBUG=fatal-criticals org.freedesktop.appstream-glib validate ./com.github.Murmele.Gittyup.appdata.xml
diff: <summary>Graphical Git client designed to help you understand and manage your source code history</summary>
  <description>
  + <p>Graphical Git client designed to help you understand and manage your source code history</p>
  +
  <p>Features:</p>
  <ul>
  <li>Fast native interface designed to help you understand and manage your source code history</li>
  