Compatibility issue with docker-compose 1.17
The traefik labels are:
- 'traefik.backend=knimed8_mailhog_1'
- 'traefik.port=8025'
- 'traefik.frontend.rule=Host:mailhog.knimed8.docker.localhost'
The should be changed to:
traefik.backend: 'knimed8_mailhog_1'
traefik.port: '8025'
traefik.frontend.rule: 'Host:mailhog.knimed8.docker.localhost'