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] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -29,7 +29,7 @@
     "express-validator": "^6.0.0",
     "moment": "^2.24.0",
     "morgan": "^1.9.1",
-    "redis": "^2.8.0",
+    "redis": "^3.1.1",
     "round-to": "^4.0.0",
     "shortid": "^2.2.14",
     "winston": "^3.2.1"