Process trades on same minute in correct order

The input file from Cointracking is specified from
newest to oldest. Hence we should reverse the list
before sorting by date for items on the same minute
to occur in correct order.

taxdata.py

@@ -124,6 +124,7 @@ def indices(col_name):
             trades.append(trade)
             lineno += 1
 
+        trades.reverse()
         trades.sort(key=lambda x: x.date)
 
         return Trades(trades)