Django has updated the is_safe_url() method that we based our implementation on.
It is now called url_has_allowed_host_and_scheme(). Our implementation remains
simple as we don't allow any hostname or scheme to be set.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>