Hints for kaffeine in main

Hints

• asv-url-not-secure
  org.kde.kaffeine.appdata.xml:113 - http://kaffeine.kde.org
  Consider using a secure (HTTPS) URL for this web link.
• asv-desktop-app-launchable-omitted
  org.kde.kaffeine.appdata.xml -
  This `desktop-application` component has no `desktop-id` launchable tag, however it contains all the necessary information to display the application. The omission of the launchable entry means that this application can not be launched directly from installers or software centers. If this is intended, this information can be ignored, otherwise it is strongly recommended to add a launchable tag as well.
• asv-content-rating-missing
  org.kde.kaffeine.appdata.xml -
  This component has no `content_rating` tag to provide age rating information. You can generate the tag data online by answering a few questions at https://hughsie.github.io/oars/
• asv-screenshot-media-url-not-secure
  org.kde.kaffeine.appdata.xml:140 - http://kde.org/images/screenshots/kaffeine.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.