Bump redis from 2.8.0 to 3.1.1

Bumps [redis](https://github.com/NodeRedis/node-redis) from 2.8.0 to 3.1.1.
- [Release notes](https://github.com/NodeRedis/node-redis/releases)
- [Changelog](https://github.com/NodeRedis/node-redis/blob/master/CHANGELOG.md)
- [Commits](redis/node-redis@v.2.8.0...v3.1.1)

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

package.json

@@ -53,7 +53,7 @@
     "rate-limit-redis": "^2.1.0",
     "readdirp": "^2.1.0",
     "recursive-readdir": "^2.2.1",
-    "redis": "^2.8.0",
+    "redis": "^3.1.1",
     "request-id": "^0.11.1",
     "request-promise-native": "^1.0.5",
     "semver": "^5.4.1",