Set the plugin type.

        4 types of stats is possible in the sensors plugin:
        - Core temperature: 'temperature_core'
        - Fan speed: 'fan_speed'
        - HDD temperature: 'temperature_hdd'
        - Battery capacity: 'battery'

def __set_type(self, stats, sensor_type):
        """Set the plugin type.

        4 types of stats is possible in the sensors plugin:
        - Core temperature: 'temperature_core'
        - Fan speed: 'fan_speed'
        - HDD temperature: 'temperature_hdd'
        - Battery capacity: 'battery'
        """
        for i in stats:
            # Set the sensors type
            i.update({'type': sensor_type})
            # also add the key name
            i.update({'key': self.get_key()})

        return stats