Add optdep on xdg-open
We're using it since we have pkgctl repo web so we should also specify this optional dependency in the README.md and the package.
Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
We're using it since we have pkgctl repo web so we should also specify this optional dependency in the README.md and the package.