Check RingingRoom socketio version api

[centreboard]

When connecting to ringing room, Wheatley should check the socket io version. Probably information if minor version differs, warning or error for the major version. https://github.com/lelandpaul/ringingroom/pull/173

I imagine there'll be a new release of Wheatley in sync with a RR version change, so if RR is higher the message could point towards updating Wheatley from pip. A higher Wheatley expected version than Ringing Room (e.g. due to releasing Wheatley slightly ahead to be installed on RR or delays in rollout of RR to all global servers)