Hints for polari in main

Hints

• asv-developer-name-tag-deprecated
  org.gnome.Polari.metainfo.xml:120 -
  The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.
• asv-nonstandard-gnome-extension
  org.gnome.Polari.metainfo.xml:157 - 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.