connectionReadyHandler = function () {
	                _this.removeListener("close", connectionCloseHandler);
	                resolve();
	            }
Create a connection to Redis.
This method will be invoked automatically when creating a new Redis instance
unless `lazyConnect: true` is passed.

When calling this method manually, a Promise is returned, which will
be resolved when the connection status is ready.
@param {function} [callback]
@return {Promise<void>}
@public