segbot_apps: 0.2.1-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `segbot_apps` to `0.2.1-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.4`
- previous version for package: `0.2.0-0`

## segbot_apps

```
* Add segbot_gui and segbot_logical_translator dependencies (#16 <https://github.com/utexas-bwi/segbot_apps/issues/16>)
```

## segbot_gui

- No changes

## segbot_logical_translator

- No changes

## segbot_navigation

- No changes