fix: negative temperature (#7)

Author: Ernst79

src/sensorpro_ble/parser.py

@@ -54,7 +54,7 @@ def _start_update(self, service_info: BluetoothServiceInfo) -> None:
         self.set_device_name(f"{name} {short_address(service_info.address)}")
         self.set_device_manufacturer("SensorPro")
         xvalue = data[10:17]
-        (volt, temp, humi, batt) = unpack(">hHHB", xvalue)
+        (volt, temp, humi, batt) = unpack(">HhHB", xvalue)
         self.update_predefined_sensor(SensorLibrary.BATTERY__PERCENTAGE, batt)
         self.update_predefined_sensor(SensorLibrary.TEMPERATURE__CELSIUS, temp / 100)
         self.update_predefined_sensor(SensorLibrary.HUMIDITY__PERCENTAGE, humi / 100)