Add support to ioredis

[omrilitov]

Hi,
I added an option named subEvent, so we could supply an ioredis client by providing the proper event as discussed here #60.

With this option we could use ioredis directly which would be great as it's a well deserved redis client.

[darrachequesne]

LGTM 👍

@nkzawa @rauchg what do you think?

[plantain-00]

I think this is a really nice feature.
How/When can I get this from npm?
What about a new release of socket.io-redis?

[plantain-00]

FI, If can't wait the next release, npm install --save https://github.com/socketio/socket.io-redis

[acuervof]

+1 for new release

[artofspeed]

Hi, with this new commit, can anyone tell me how do I exactly pass in an io-redis instance? Thank you very much!

[omrilitov]

@artofspeed Just pass messageBuffer as the subEvent option, and you'll be able to use an ioredis instance in the pubClient/subClient.
But this commit isn't out yet, we are still waiting for a new release