update traefik to v2.x

[ycyin]

Updated traefik example #380

This is the version I'm using on production

[Joxit]

Hi, thank you for your contribution 😄

I posted one comment in your PR

[jnovack]

I am not part of the team, just making suggestions.

[jnovack]

SUGGESTION:

These limits and reservations are way to egregious for testing (even for some swarm productions)! I understand it's an example, but I feel we can be a little bit more responsible with examples.

Traefik v2 takes up ~40MB RAM idle, you don't need reserve 2G (it's not V3! HA!)

Suggested:

       limits:
          cpus: '2'
          memory: 4g
        reservations:
          cpus: '0.1'
          memory: 128MB

[jnovack]

SUGGESTION:

Again, make it neutral to the most amount of people. TZ=UTC would be neutral.