AttributeError: 'list' object has no attribute 'items' for all docker-compose commands

Every docker-compose command fails with `AttributeError: 'list' object has no attribute 'items'`

My docker-compose looks like this:

```
db:
  image: postgres:9.4
  ports:
    - "5432"
web:
  build: .
  command: yesod devel
  environment:
    - HOST=0.0.0.0
    - PGUSER=postgres
    - PGPASS
    - PGHOST=db
  stdin_open: true
  volumes:
   - .:/app
  ports:
   - "3000:3000"
  links:
   - db
```
