Release 0.23.4

# History

## 0.23.4

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.23.4/bootstrap.sh
sudo DOKKU_TAG=v0.23.4 bash bootstrap.sh
```

### Bug Fixes

- #4402: @josegonzalez fix: correctly handle is-deployed check
- #4399: @josegonzalez Drop extra log output in cron plugin

### Documentation

- #4400: @solvethex Add tail option

contrib/dokku-installer.py

@@ -15,7 +15,7 @@ import subprocess
 import sys
 import threading
 
-VERSION = 'v0.23.3'
+VERSION = 'v0.23.4'
 
 def bytes_to_string(b):
     if type(b) == bytes: