Update async_client.py

typo

Author: luk0y

binance/async_client.py

@@ -1727,7 +1727,7 @@ async def futures_premium_index_klines(self, **params):
 
     futures_premium_index_klines.__doc__ = Client.futures_index_price_klines.__doc__
 
-    async def futures_continous_klines(self, **params):
+    async def futures_continuous_klines(self, **params):
         return await self._request_futures_api("get", "continuousKlines", data=params)
 
     async def futures_historical_klines(
@@ -5363,4 +5363,4 @@ async def futures_v1_get_convert_order_status(self, **params):
         return await self._request_futures_api("get", "convert/orderStatus", signed=True, data=params, version=1)
 
     futures_v1_get_convert_order_status.__doc__ = Client.futures_v1_get_convert_order_status.__doc__
-            
+