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

contrib/dokku-installer.py

@@ -10,7 +10,7 @@ import subprocess
 import sys
 import threading
 
-VERSION = 'v0.18.4'
+VERSION = 'v0.18.5'
 
 hostname = ''
 try: