code: func (b *Bittrex) GetBalance(currency string) (balance Balance, err error) {
  	r, err := b.client.do("GET", "account/getbalance?currency="+strings.ToUpper(currency), "", true)
  	if err != nil {
  		return
  	}
  	var response jsonResponse
  	if err = json.Unmarshal(r, &response); err != nil {
  		return
  	}
  	if err = handleErr(response); err != nil {
  		return
  	}
  	err = json.Unmarshal(response.Result, &balance)
  	return
  }
docs: // Getbalance is used to retrieve the balance from your account for a specific currency.
  // currency: a string literal for the currency (ex: LTC)