Fix "if" condition with "if not" for check if trade is open.

freqtrade/freqtradebot.py

@@ -523,7 +523,7 @@ class FreqtradeBot(object):
             trade.update(order)
 
             # Updating wallets when order is closed
-            if trade.is_open == False:
+            if not trade.is_open:
                 self.wallets.update()
 
     def get_sell_rate(self, pair: str, refresh: bool) -> float: