[feature request] Add a config option for redis hostname

[t-chab]

Hi.

Is it possible to add a new configuration option to allow customisation of redis server hostname ?

Something like that :

config = {
    enabled_plugins = {
      "9gag",
      "eur",
      [...]    
      "youtube" },
    redis = { "myRedisHostname:6379" }
    sudo_users = {our_id},
    disabled_channels = {}
  }

Thanks