Hints for gnome-screenshot in main

Hints

• asv-url-not-secure
  :195 - http://www.gnome.org/friends/
  Consider using a secure (HTTPS) URL for this web link.
• asv-nonstandard-gnome-extension
  :204 - 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.
• asv-description-first-word-not-capitalized
  :210 -
  The description line does not start with a capitalized word, project name or number.
• asv-description-first-word-not-capitalized
  :217 -
  The description line does not start with a capitalized word, project name or number.