apply formating

Author: TadakiAsechi

tests/client/test_base_client.py

@@ -200,4 +200,4 @@ async def create_stream(*args, **kwargs):
     params = mock_transport.send_message_streaming.call_args.args[0]
     assert params.configuration.history_length == 0
     assert params.configuration.blocking is True
-    assert params.configuration.accepted_output_modes == ['text/plain']
+    assert params.configuration.accepted_output_modes == ['text/plain']