frontier_exploration: 0.2.2-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `frontier_exploration` to `0.2.2-0`:

- upstream repository: https://github.com/paulbovbel/frontier_exploration.git
- release repository: https://github.com/paulbovbel/frontier_exploration-release.git
- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.11`
- previous version for package: `0.2.1-0`

## frontier_exploration

```
* clean up conditionals and comments for more logical flow
* switch to shared from raw ptr
* Contributors: Paul Bovbel
```