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>

Author: dependabot[bot]

package-lock.json

@@ -92,7 +92,7 @@
     "react-router": "^5.2.1",
     "react-router-dom": "^5.3.0",
     "react-twitter-embed": "^3.0.3",
-    "redis": "^2.8.0",
+    "redis": "^3.1.1",
     "redux": "^4.1.2",
     "redux-thunk": "^2.4.1",
     "remark-gfm": "^3.0.1",