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

@@ -162,7 +162,7 @@
     "react-test-renderer": "^15.3.1",
     "react-transform-catch-errors": "^1.0.0",
     "react-transform-hmr": "^1.0.1",
-    "redis": "^2.4.2",
+    "redis": "^3.1.1",
     "redux": "^3.0.5",
     "redux-logger": "^2.0.2",
     "redux-thunk": "^0.1.0",