Start the watching loop.

async def _watch(self):
        """
        Start the watching loop.
        """

        file_name = os.path.basename(self._file_path)
        logger.info(
            'Watching %s "%s"',
            self.THING,
            self._file_path,
        )

        while self._running:
            evt = await self._watcher.get_event()

            if evt.name == file_name:
                await self._load()
                logger.info(
                    'Reloading changed %s from "%s"',
                    self.THING,
                    self._file_path
                )