Test docker-compose.yml
`version: "2.2"

services:
www:
image: nginx
ports:
- "8000-8010:80"`

Output of docker-compose's port command, only reports a single port mapping:

$ docker-compose port www 80
0.0.0.0:8004

Expected output, should report all port mappings as docker cli:

$ docker port testing_www_1
80/tcp -> 0.0.0.0:8004
80/tcp -> 0.0.0.0:8003
80/tcp -> 0.0.0.0:8002
80/tcp -> 0.0.0.0:8001
80/tcp -> 0.0.0.0:8000
80/tcp -> 0.0.0.0:8005
80/tcp -> 0.0.0.0:8010
80/tcp -> 0.0.0.0:8009
80/tcp -> 0.0.0.0:8008
80/tcp -> 0.0.0.0:8007
80/tcp -> 0.0.0.0:8006