Lab 7.2 Traefik image tag 1.7 needs to be specified

I think version 2 made changes that break the way the lab is setup. Without specifying the tag, I get the following error

$ kubectl logs -n kube-system traefik-ingress-controller-ghn8w --follow
2019/10/04 01:24:38 command traefik error: failed to decode configuration from flags: field not found, node: kubernetes

The solution appears rather simple.

# . . . . .
      hostNetwork: True
      containers:
      - image: traefik:1.7 # Add the 1.7 tag here
        name: traefik-ingress-lb
        ports:
# . . . . .

If you have a better solution feel free to share, but this one worked for me.