chore(deps): bump redis from 2.8.0 to 3.1.2

Bumps [redis](https://github.com/redis/node-redis) from 2.8.0 to 3.1.2.
- [Release notes](https://github.com/redis/node-redis/releases)
- [Changelog](https://github.com/redis/node-redis/blob/master/CHANGELOG.md)
- [Commits](redis/node-redis@v.2.8.0...v3.1.2)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: indirect
...

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