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

docs/assets/versions.json

@@ -13,6 +13,6 @@
     "0.13.4",
     "0.14.6",
     "0.15.5",
-    "0.16.3"
+    "0.16.4"
   ]
 }