hokuyo_node: 1.7.8-0 in 'hydro/release.yaml' [bloom]

Increasing version of package(s) in repository `hokuyo_node`:
- previous version: `1.7.7-0`
- new version: `1.7.8-0`
- distro file: `hydro/release.yaml`
- bloom version: `0.4.4`