Get order history issue

[reenko]

In official version (https://bittrex.github.io/api/v1-1)

market - a string literal for the market (ie. BTC-LTC). If omitted, will return for all markets

But in current package market is required. https://github.com/AndrewBarba/bittrex-node/blob/master/src/bittrex-client.js#L222