Update watchdog/ofwatchdog versions to latest

[alexellis]

Expected Behaviour

Update watchdog/ofwatchdog versions to latest

Current Behaviour

We are a little bit behind

Possible Solution

• Edit each Dockerfile in this repository and send a PR.

• The latest watchdog release is here: https://github.com/openfaas/faas/releases

• The latest of-watchdog release is here: https://github.com/openfaas-incubator/of-watchdog/releases

[oshka]

I'll do this!

[alexellis]

Thank you @oshka, please see the contribution guide https://github.com/openfaas/faas/blob/master/CONTRIBUTING.md

It's important that PRs must be signed-off with git commit -s, this is explained in the guide above.

[oshka]

I apologize for the carelessness. I fixed it.