NOREF - Fix Invalid docker-compose.yml sample

Without specifying this the user gets:
docker-compose up -d
ERROR: Top level object in './docker-compose.yml' needs to be an object not '<class 'NoneType'>'.
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Vitor Reis 2018-09-25 21:30:57 +02:00 committed by GitHub
parent e438506e14
commit 1596b778fe
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@ -60,7 +60,7 @@ Compose to set up and run WordPress. Before starting, make sure you have
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data:
db_data: {}
```
> **Notes**: