genpy: 0.5.4-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `genpy` to `0.5.4-0`:

- upstream repository: git@github.com:ros/genpy.git
- release repository: https://github.com/ros-gbp/genpy-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.16`
- previous version for package: `0.5.3-0`

## genpy

```
* add support for fixed-width floating-point and integer array values (ros/ros_comm#400 <https://github.com/ros/ros_comm/issues/400>)
* add missing test dependency on yaml
```