Release 0.15.2

# History

## 0.15.2

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.15.2/bootstrap.sh
sudo DOKKU_TAG=v0.15.2 bash bootstrap.sh
```

### Bug Fixes

- #3488: @josegonzalez fix: call ps:retire from system service

docs/assets/versions.json

@@ -12,6 +12,6 @@
     "0.12.13",
     "0.13.4",
     "0.14.6",
-    "0.15.1"
+    "0.15.2"
   ]
 }