resolvconf package needs dependency on ifupdown

When I install resolvconf on a minimal install of Ubuntu 18.04 (bionic), I see this:

# apt-get install resolvconf
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  resolvconf
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/48.2 kB of archives.
After this operation, 187 kB of additional disk space will be used.
Preconfiguring packages ...
/tmp/resolvconf.config.XleExb: 13: /tmp/resolvconf.config.XleExb: ifquery: not found
/tmp/resolvconf.config.XleExb: 13: /tmp/resolvconf.config.XleExb: ifquery: not found
Selecting previously unselected package resolvconf.
(Reading database ... 90542 files and directories currently installed.)
Preparing to unpack .../resolvconf_1.79ubuntu10_all.deb ...
Unpacking resolvconf (1.79ubuntu10) ...
Processing triggers for ureadahead (0.100.0-20) ...
Processing triggers for systemd (237-3ubuntu10) ...
Processing triggers for man-db (2.8.3-2) ...
Setting up resolvconf (1.79ubuntu10) ...
/var/lib/dpkg/info/resolvconf.config: 13: /var/lib/dpkg/info/resolvconf.config: ifquery: not found
/var/lib/dpkg/info/resolvconf.config: 13: /var/lib/dpkg/info/resolvconf.config: ifquery: not found
Created symlink /etc/systemd/system/sysinit.target.wants/resolvconf.service → /lib/systemd/system/resolvconf.service.
Created symlink /etc/systemd/system/systemd-resolved.service.wants/resolvconf-pull-resolved.path → /lib/systemd/system/resolvconf-pull-resolved.path.
resolvconf-pull-resolved.service is a disabled or a static unit, not starting it.
resolvconf-pull-resolved.service is a disabled or a static unit, not starting it.
Processing triggers for systemd (237-3ubuntu10) ...
Processing triggers for ureadahead (0.100.0-20) ...
Processing triggers for resolvconf (1.79ubuntu10) ...

The "ifquery" program is provided by the ifupdown package. Therefore, resolvconf needs to include ifupdown in its Depends: clause. (Currently, ifupdown is mentioned in Enhances:)