Merge pull request #358 from alpacahq/fix_asyncio_sleep_usage

Fix: asyncio methods should use asyncio.sleep()

Author: Shlomi Kushchi

alpaca_trade_api/polygon/streamconn.py

@@ -1,6 +1,5 @@
 import asyncio
 import json
-import time
 import re
 import os
 import websockets
@@ -138,7 +137,7 @@ async def _ensure_ws(self):
                                       f'Polygon Connection Failed ({e})'})
                 self._ws = None
                 self._retries += 1
-                time.sleep(self._retry_wait * self._retry)
+                await asyncio.sleep(self._retry_wait * self._retry)
         else:
             raise ConnectionError("Max Retries Exceeded")