realtime_tools: 1.8.3-1 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `realtime_tools` to `1.8.3-1`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.9`
- previous version for package: `1.8.3-0`

## realtime_tools

```
* Fix linking
  The library needs to be linked against roscpp and Boost thread.
  GCC won't complain about missing symbols for a shared library,
  but other linkers (like clang's) will not accept it by default.
* Added Travis support
* Renamed manifest.xml so it doesn't brek rosdep
* Contributors: Adolfo Rodriguez Tsouroukdissian, Dave Coleman, Paul Mathieu
```