Eli Schwartz authored May 30, 2018 and Allan McRae committed Jun 18, 2018

pacman accepts these, and there is no good reason to be more restrictive
ourselves; we should follow the example of "depends" here.

Update the documentation to actually state that this is supported.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>