How to use with sentinel?

I've been attempting to pass my own `redisClient`, so I could use sentinel-aware `ioredis`. It looks like this won't work, and the injection is only for testing, since `redisClient` needs decorations provided by this repo (`upload`, `activate`, etc) and it doesn't seem possible to use an alternate redis lib ([since it relies on a particular method signature](https://github.com/ember-cli-deploy/ember-cli-deploy-redis/blob/master/lib/redis.js#L26-L30)). Am I understanding this correctly? Anything I can do here?

Start with lib/redis.js, especially the method signature around lines 26-30, and trace how the injected redisClient receives the repo's upload and activate decorations. Check whether ioredis Sentinel can satisfy those expectations; done means clearly establishing the supported approach or documenting the changes needed for Sentinel support.

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