Daniil Bogochanov

Problem: When the tool subscribes to futures contracts we received data but it will not be emitted because the market will be undefined. And it is right for heartbeat messages....

I do not get data from Bitfinex future contracts. The problem is the [market](https://github.com/altangent/ccxws/blob/master/src/exchanges/BitfinexClient.ts#L286) which is undefined when try to get via "channel.pair".