openhrp3: 3.1.7-4 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `openhrp3` to `3.1.7-4`:

- upstream repository: https://github.com/fkanehiro/openhrp3.git
- release repository: https://github.com/tork-a/openhrp3-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.12`
- previous version for package: `3.1.7-3`