[pkgdb] rubygem-gdk_pixbuf2 summary updated by tibbs

[Fedora PackageDB]

tibbs set package rubygem-gdk_pixbuf2 summary to Ruby binding of GdkPixbuf-2.x

To make changes to this package see:
  https://admin.fedoraproject.org/pkgdb/acls/name/rubygem-gdk_pixbuf2