stopped containers are always included

while studying the code I noticed the referred line. Should it not be the following?:
```
all := false
```
If I understand the code correctly `all` is always `True` and the configuration option `-include-stopped` has no effect.

https://github.com/jwilder/docker-gen/blob/4edc190faa34342313589a80e3a736cafb45919b/cmd/docker-gen/main.go#L159