Hints for file-roller in main

Hints

• asv-summary-has-dot-suffix
  org.gnome.FileRoller.appdata.xml:152 - Отваряне, създаване и промяна на архиви и компресирани файлове.
  The component summary should not end with a dot (`.`).
• asv-nonstandard-gnome-extension
  org.gnome.FileRoller.appdata.xml:571 - 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.