Bump ioredis from 4.10.0 to 4.11.1

Bumps [ioredis](https://github.com/luin/ioredis) from 4.10.0 to 4.11.1.
- [Release notes](https://github.com/luin/ioredis/releases)
- [Changelog](https://github.com/luin/ioredis/blob/master/Changelog.md)
- [Commits](redis/ioredis@v4.10.0...v4.11.1)

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

package.json

@@ -30,7 +30,7 @@
     "babel-minify": "^0.5.0",
     "browserify": "^16.2.3",
     "dog-names": "^2.0.0",
-    "ioredis": "^4.10.0",
+    "ioredis": "^4.11.1",
     "koa": "^2.7.0",
     "koa-router": "^7.4.0",
     "koa-static": "^5.0.0",