usb_cam: 0.1.12-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `usb_cam` to `0.1.12-0`:

- 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: `0.5.12`
- previous version for package: `0.1.11-1`

## usb_cam

```
* Merge pull request #22 from dekent/develop
  White balance parameters
* Parameter to enable/disable auto white balance
* Added parameters for white balance
* uses version major to check for av_codec
* uses version header to check for AV_CODEC_ID_MJPEG
* Contributors: David Kent, Russell Toris
```