docs: use 127.0.0.1 instead of loopback in README (#32)
docs: use 127.0.0.1 instead of loopback in README (#32)

`cl/settings/05-private.example` has `ALLOWED_HOSTS = ['127.0.0.1']`.
Navigating to localhost results in error

```
DisallowedHost: Invalid HTTP_HOST header: 'localhost:8000'. You may need to add 'localhost' to ALLOWED_HOSTS.
```

Navigating to 127.0.0.1 works.
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