Release 0.17.9

# History

## 0.17.9

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.17.9/bootstrap.sh
sudo DOKKU_TAG=v0.17.9 bash bootstrap.sh
```

### Bug Fixes

- #3593: @JakeAngell Fix nginx template for https in "Connection" header

### Documentation

- #3595: @josegonzalez Drop extra help output for trace

contrib/dokku-installer.py

@@ -10,7 +10,7 @@ import subprocess
 import sys
 import threading
 
-VERSION = 'v0.17.8'
+VERSION = 'v0.17.9'
 
 hostname = ''
 try: