README section on creation of new repos is out of date. maybe?

I think it requires "namespace": "a_namespace"

```
curl -H "Authorization: Bearer $TOKEN" \
       -H "Content-Type: application/json" \
       -X POST \
       -d '{"name": "repo_name", "namespace": "a_namespace"}' \
       "http://localhost:3000/api/repos"
```

Maybe also content-type?
