jackal: 0.3.0-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `jackal` to `0.3.0-0`:

- upstream repository: https://github.com/jackal/jackal.git
- release repository: https://github.com/clearpath-gbp/jackal-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.11`
- previous version for package: `0.2.1-0`

## jackal_control

- No changes

## jackal_description

```
* Add comment about accessory args.
* Add front laser accessory to description.
* Contributors: Mike Purvis
```

## jackal_diff_drive_controller

- No changes

## jackal_msgs

- No changes