Release 0.20.4

# History

## 0.20.4

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.20.4/bootstrap.sh
sudo DOKKU_TAG=v0.20.4 bash bootstrap.sh
```

### New Features

- #3936: @josegonzalez Enable limiting and reserving gpu resources

### Documentation

- #3937: @josegonzalez Add minor documentation for the kubernetes and nomad schedulers

### Other

- #3935: @dependabot-preview[bot] chore(deps): bump jinja2 from 2.11.1 to 2.11.2 in /tests/apps/python-flask
- #3934: @dependabot-preview[bot] chore(deps): bump github.com/golang/protobuf from 1.3.5 to 1.4.0 in /tests/apps/gogrpc
- #3933: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 9.4.27.v20200227 to 9.4.28.v20200408 in /tests/apps/java

docs/getting-started/installation.md

@@ -21,8 +21,8 @@ To install the latest stable version of Dokku, you can run the following shell c
 
 ```shell
 # for debian systems, installs Dokku via apt-get
-wget https://raw.githubusercontent.com/dokku/dokku/v0.20.3/bootstrap.sh;
-sudo DOKKU_TAG=v0.20.3 bash bootstrap.sh
+wget https://raw.githubusercontent.com/dokku/dokku/v0.20.4/bootstrap.sh;
+sudo DOKKU_TAG=v0.20.4 bash bootstrap.sh
 ```
 
 The installation process takes about 5-10 minutes, depending upon internet connection speed.