python_qt_binding: 0.2.12-0 in 'groovy/distribution.yaml' [bloom]

Increasing version of package(s) in repository `python_qt_binding` to `0.2.12-0`:

- distro file: `groovy/distribution.yaml`
- bloom version: `0.5.1`
- previous version for package: `0.2.11-0`

## python_qt_binding

```
* python 3 compatibility
* fix sip bindings when paths contain spaces (#9 <https://github.com/ros-visualization/python_qt_binding/issues/9>)
```