Hints for gnome-subtitles in main

Hints

• asv-screenshot-media-url-not-secure
  org.gnome.GnomeSubtitles.appdata.xml:87 - http://gnome-subtitles.sourceforge.net/files/screenshots/Screenshot-GnomeSubtitles-VideoFrames.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.
• asv-screenshot-media-url-not-secure
  org.gnome.GnomeSubtitles.appdata.xml:90 - http://gnome-subtitles.sourceforge.net/files/screenshots/Screenshot-GnomeSubtitles-SynchronizeTimings.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.
• asv-url-not-secure
  org.gnome.GnomeSubtitles.appdata.xml:81 - http://www.gnomesubtitles.org/donate
  Consider using a secure (HTTPS) URL for this web link.
• asv-screenshot-media-url-not-secure
  org.gnome.GnomeSubtitles.appdata.xml:84 - http://gnome-subtitles.sourceforge.net/files/screenshots/Screenshot-GnomeSubtitles-VideoTimesTranslation.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.
• asv-content-rating-missing
  org.gnome.GnomeSubtitles.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-url-not-secure
  org.gnome.GnomeSubtitles.appdata.xml:79 - http://gnomesubtitles.org
  Consider using a secure (HTTPS) URL for this web link.