Bump google-protobuf from 3.7.1 to 3.8.0
Bump google-protobuf from 3.7.1 to 3.8.0

Bumps [google-protobuf](https://github.com/protocolbuffers/protobuf) from 3.7.1 to 3.8.0.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.7.1...v3.8.0)
malijs/mali