Release 0.17.3

# History

## 0.17.3

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.17.3/bootstrap.sh
sudo DOKKU_TAG=v0.17.3 bash bootstrap.sh
```

### Bug Fixes

- #3570: @znz Fix typos in trace help

### New Features

- #3574: @josegonzalez Add support for pulling app status from scheduler plugins
- #3571: @znz Simplify hostname_regex

debian/control

@@ -1,5 +1,5 @@
 Package: dokku
-Version: 0.17.2
+Version: 0.17.3
 Section: web
 Priority: optional
 Architecture: amd64