dcoder42

This PR fixes the following exception on Windows: ``` Traceback (most recent call last): File "C:\Development\Python\lib\asyncio\events.py", line 80, in _run self._context.run(self._callback, *self._args) File "C:\Development\HomeAssistant\config\deps\Python39\site-packages\serial_asyncio\__init__.py", line 307, in _poll_write if self.serial.out_waiting...