fixing _close

Author: 0xfMissingNo

alpaca_trade_api/stream.py

@@ -655,12 +655,10 @@ def run(self):
             pass
 
     async def _close(self):
-        await asyncio.gather(
-            self.stop_ws(),
-            self._trading_ws.close(),
-            self._data_ws.close(),
-            self._crypto_ws.close()
-            )
+        tasks = (task for task in 
+        (self.stop_ws(), self._trading_ws.close(), self._data_ws.close(), self._crypto_ws.close())
+        )
+        await asyncio.gather(*tasks)
 
     def close(self):
         loop = asyncio.get_event_loop()