frontier_exploration: 0.2.0-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `frontier_exploration` to `0.2.0-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.2`
- previous version for package: `0.1.9-0`

## frontier_exploration

```
* rename test file
* add more costmap_tools tests
* refactor with frontier_search strategy object
* remove calls to parent costmap instance
* refactored to raii
* fix gmapping compatibility using new "explore_clear_space" parameter
* Contributors: Paul Bovbel
```