client npm upgrade: bump eslint from 6.7.2 to 6.8.0 in /client

Bumps [eslint](https://github.com/eslint/eslint) from 6.7.2 to 6.8.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v6.7.2...v6.8.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>