Release 0.16.4

# History

## 0.16.4

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.16.4/bootstrap.sh
sudo DOKKU_TAG=v0.16.4 bash bootstrap.sh
```

### Bug Fixes

- #3547: @josegonzalez Correct retrieval of resource values for alternative schedulers

### New Features

- #3546: @josegonzalez Add ability to trigger an arbitrary plugin hook

debian/control

@@ -1,5 +1,5 @@
 Package: dokku
-Version: 0.16.3
+Version: 0.16.4
 Section: web
 Priority: optional
 Architecture: amd64