Release 0.17.2

# History

## 0.17.2

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.17.2/bootstrap.sh
sudo DOKKU_TAG=v0.17.2 bash bootstrap.sh
```

### Bug Fixes

- #3568: @josegonzalez Correct issue with clearing global domains

contrib/dokku-installer.py

@@ -10,7 +10,7 @@ import subprocess
 import sys
 import threading
 
-VERSION = 'v0.17.1'
+VERSION = 'v0.17.2'
 
 hostname = ''
 try: