pr2_ethercat_drivers: 1.8.8-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `pr2_ethercat_drivers` to `1.8.8-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.1`
- previous version for package: `1.8.7-0`