Update the stats.

def update(self):
        """Update the stats."""
        # Reset stats
        self.reset()

        # Return psutil version as a tuple
        if self.input_method == 'local':
            # psutil version only available in local
            try:
                self.stats = psutil_version_info
            except NameError:
                pass
        else:
            pass

        return self.stats