Release 0.18.5

# History

## 0.18.5

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.18.5/bootstrap.sh
sudo DOKKU_TAG=v0.18.5 bash bootstrap.sh
```

### Bug Fixes

- #3704: @josegonzalez Fail nginx:build-config if the image does not exist

debian/control

@@ -1,5 +1,5 @@
 Package: dokku
-Version: 0.18.4
+Version: 0.18.5
 Section: web
 Priority: optional
 Architecture: amd64