A bug in parseTrade() for Kuna Exchange fixed (side is undefined)
A bug in parseTrade() for Kuna Exchange fixed (side is undefined)

- The bug was with 'side' field. It was always 'undefined'.
- The problem was in the values of 'trend' raw field. Kuna returns 'sell' or 'buy' values in the field.
- 'side' raw field always 'null'
- I don't know why are we waiting 'ask' | 'bid' values in this (trend|side) raw fields. May be 'side' field was containing such values some times ago. However, now 'side' is always null.

ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt