catkin: 0.5.84-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `catkin` to `0.5.84-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.1`
- previous version for package: `0.5.83-0`

## catkin

```
* fix handling include directories for generated header in devel space (regression from 0.5.83, #600 <https://github.com/ros/catkin/issues/600>)
```