support for newer versions on pymodbus

Author: HotNoob

classes/transports/modbus_rtu.py

@@ -1,6 +1,11 @@
 import logging
 from classes.protocol_settings import Registry_Type, protocol_settings
-from pymodbus.client.sync import ModbusSerialClient
+
+try:
+    from pymodbus.client.sync import ModbusSerialClient
+except ImportError:
+    from pymodbus.client import ModbusSerialClient
+
 from .modbus_base import modbus_base
 from configparser import SectionProxy
 from defs.common import find_usb_serial_port, get_usb_serial_port_info, strtoint