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

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

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

## segbot

- No changes

## segbot_bringup

```
* segbot_bringup: install udev rules (#26 <https://github.com/utexas-bwi/segbot/issues/26>)
* fix some problems catkin_lint discovered
```

## segbot_description

```
* fix some problems catkin_lint discovered
```

## segbot_firmware

- No changes

## segbot_sensors

```
* fix some problems catkin_lint discovered
* segbot_sensors: make roslaunch checks complete (#20 <https://github.com/utexas-bwi/segbot/issues/20>)
```