Merge pull request sammchardy#844 from bmarengo/bmarengo-patch-1

ThreadedWebsocketManager fix

Author: Sam McHardy

binance/streams.py

@@ -1196,14 +1196,14 @@ def start_symbol_book_ticker_socket(self, callback: Callable, symbol: str) -> st
     def start_book_ticker_socket(self, callback: Callable) -> str:
         return self._start_async_socket(
             callback=callback,
-            socket_name='symbol_book_ticker_socket',
+            socket_name='book_ticker_socket',
             params={}
         )
 
     def start_multiplex_socket(self, callback: Callable, streams: List[str]) -> str:
         return self._start_async_socket(
             callback=callback,
-            socket_name='symbol_book_ticker_socket',
+            socket_name='multiplex_socket',
             params={
                 'streams': streams
             }