genpy: 0.5.2-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `genpy` to `0.5.2-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.6`
- previous version for package: `0.5.1-0`

## genpy

```
* fix usage of load_manifest() introduced in 0.5.1 (#28 <https://github.com/ros/genpy/issues/28>)
```