usb_cam: 0.1.9-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `usb_cam` to `0.1.9-0`:

- upstream repository: https://github.com/bosch-ros-pkg/usb_cam.git
- release repository: https://github.com/bosch-ros-pkg-release/usb_cam-release.git
- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.11`
- previous version for package: `0.1.8-0`

## usb_cam

```
* Uses ros::Rate to enforce software framerate instead of custom time check
* Merge pull request #16 from liangfok/feature/app_level_framerate_control
  Modified to enforce framerate control at the application level in additi...
* Modified to enforce framerate control at the application level in addition to at the driver level.  This is necessary since the drivers for my webcam did not obey the requested framerate.
* Contributors: Russell Toris, liang
```