Lita::Room.find_by_id can't find private room if created after connect

[crunis]

Steps to reproduce:

1. Connect your Lita bot to Slack
2. Create a private room and invite your boot
3. Execute a handler that will try Lita::Room.find_by_id(response.room.id), you get a nil object
4. Disconnect and reconnect your Lita bot and try again. This time the room object is received.

Looks like the list of private rooms is retrieved on connecting to Slack and is not refreshed?