post_upgrade() {
  if [ "$(vercmp $2 1.6.0-2)" -lt 0 ]
  then
    echo 'Since 1.6.0-2 the conf.d file is no longer in use. We have enabled systemd support and providing upstream systemd units.'
    echo 'You will need to use the systemd way (overriding in /etc/systemd/system/dnscrypt-proxy.{service,socket}.d) to apply your customization.'
  fi
}
