Release 0.13.1

# History

## 0.13.1

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.13.1/bootstrap.sh
sudo DOKKU_TAG=v0.13.1 bash bootstrap.sh
```

### Bug Fixes

- #3324: @josegonzalez Add missing source of config functions

docs/assets/versions.json

@@ -10,6 +10,6 @@
     "0.10.5", 
     "0.11.6", 
     "0.12.13", 
-    "0.13.0"
+    "0.13.1"
   ]
 }