Hints for nautilus in main

Hints

• asv-release-time-missing-for-snapshot
  org.gnome.Nautilus.metainfo.xml:317 - date
  The release entry is missing the `date` property. Ensure to add it before publishing the snapshot release.
• asv-nonstandard-gnome-extension
  org.gnome.Nautilus.metainfo.xml:762 - kudos
  This tag is a GNOME-specific extension to AppStream and not part of the official specification. Do not expect it to work in all implementations and in all software centers.