Release 0.21.1

# History

## 0.21.1

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.21.1/bootstrap.sh
sudo DOKKU_TAG=v0.21.1 bash bootstrap.sh
```

### Documentation

- #4060: @josegonzalez Add warning about the 0.21.0 release

docs/getting-started/install/docker.md

@@ -3,7 +3,7 @@
 Pull the dokku/dokku image:
 
 ```shell
-docker pull dokku/dokku:0.21.0
+docker pull dokku/dokku:0.21.1
 ```
 
 Next, run the image.
@@ -17,7 +17,7 @@ docker run \
   --publish 8443:443 \
   --volume /var/lib/dokku:/mnt/dokku \
   --volume /var/run/docker.sock:/var/run/docker.sock \
-  dokku/dokku:0.21.0
+  dokku/dokku:0.21.1
 ```
 
 Dokku is run in the following configuration:

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/v0.21.0/bootstrap.sh;
-sudo DOKKU_TAG=v0.21.0 bash bootstrap.sh
+wget https://raw.githubusercontent.com/dokku/dokku/v0.21.1/bootstrap.sh;
+sudo DOKKU_TAG=v0.21.1 bash bootstrap.sh
 ```
 
 The installation process takes about 5-10 minutes, depending upon internet connection speed.