rosbridge_suite: 0.6.0-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `rosbridge_suite` to `0.6.0-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.9`
- previous version for package: `0.5.5-1`

## rosapi

```
* Ensure proper locking for Parameter Server access
* Contributors: Lasse Rasinen
```

## rosbridge_library

```
* Ensure that service name is a string
  Closes #104 <https://github.com/RobotWebTools/rosbridge_suite/issues/104>
* Contributors: Piyush Khandelwal
```

## rosbridge_server

- No changes

## rosbridge_suite

- No changes