Release 0.20.1

# History

## 0.20.1

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.20.1/bootstrap.sh
sudo DOKKU_TAG=v0.20.1 bash bootstrap.sh
```

### Bug Fixes

- #3916: @josegonzalez Change error exit to warning when no apps exist

### New Features

- #3918: @josegonzalez Upgrade herokuish to 0.5.11
- #3915: @josegonzalez Add ability to check if a plugin has been installed
- #3914: @josegonzalez Add ability to change or disable the access/error log path
- #3913: @josegonzalez Upgrade herokuish

### Documentation

- #3907: @josegonzalez Add sponsoring link to issue template
- #3904: @jazzzz Update dokku-apt entry
- #3902: @josegonzalez Remove extra commas from network docs

### Other

- #3909: @dependabot-preview[bot] chore(deps): bump werkzeug from 1.0.0 to 1.0.1 in /tests/apps/python-flask
- #3903: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 172 to 173 in /tests/apps/php

docs/assets/style.css

@@ -39,13 +39,13 @@ h1 {
   font-size: 1.6em;
 }
 .header .navbar-brand a {
-  background-image: url(https://cdn.jsdelivr.net/gh/dokku/dokku@v0.20.0/docs/assets/dokku.png);
+  background-image: url(https://cdn.jsdelivr.net/gh/dokku/dokku@v0.20.1/docs/assets/dokku.png);
   text-indent: 40px;
 }
 .blurb {
   color: #424242;
   background-color: #ededed;
-  background-image: url(https://cdn.jsdelivr.net/gh/dokku/dokku@v0.20.0/docs/assets/gplaypattern.png);
+  background-image: url(https://cdn.jsdelivr.net/gh/dokku/dokku@v0.20.1/docs/assets/gplaypattern.png);
   padding: 45px 0;
   text-align: center;
 }