'ufw --dry-run (enable|disable)' changes /etc/ufw/ufw.conf

Running the command `ufw --dry-run enable` or `ufw --dry-run disable` updates the `ENABLED` option in `/etc/ufw/ufw.conf`. The firewall is not started or stopped.

I would expect that no changes are made to the `/etc/ufw/ufw.conf` file when the `--dry-run` flag is used.

---

# ufw --version
ufw 0.35
Copyright 2008-2015 Canonical Ltd.

----

# apt-cache policy $(dpkg --get-selections | grep ufw | awk '{print $1}')
python-ufw:
  Installed: 0.35-4
  Candidate: 0.35-4
  Version table:
 *** 0.35-4 500
        500 http://deb.debian.org/debian stretch/main amd64 Packages
        100 /var/lib/dpkg/status
ufw:
  Installed: 0.35-4
  Candidate: 0.35-4
  Version table:
 *** 0.35-4 500
        500 http://deb.debian.org/debian stretch/main amd64 Packages
        100 /var/lib/dpkg/status