Release 0.19.6

# History

## 0.19.6

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.19.6/bootstrap.sh
sudo DOKKU_TAG=v0.19.6 bash bootstrap.sh
```

### Other

- #3761: @pithyless Fix type-errors in dokku-installer.py
- #3759: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 163 to 164 in /tests/apps/php
- #3758: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 9.4.21.v20190926 to 9.4.22.v20191022 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/v0.19.5/bootstrap.sh;
-sudo DOKKU_TAG=v0.19.5 bash bootstrap.sh
+wget https://raw.githubusercontent.com/dokku/dokku/v0.19.6/bootstrap.sh;
+sudo DOKKU_TAG=v0.19.6 bash bootstrap.sh
 ```
 
 The installation process takes about 5-10 minutes, depending upon internet connection speed.