update typing hints for UART pins of ModbusRTU and Serial in serial.py, related to brainelectronics#17 and brainelectronics#43

Author: brainelectronics

umodbus/serial.py

@@ -41,7 +41,7 @@ class ModbusRTU(Modbus):
     :param      parity:      The parity, default None
     :type       parity:      Optional[int]
     :param      pins:        The pins as list [TX, RX]
-    :type       pins:        List[int, int]
+    :type       pins:        List[Union[int, Pin], Union[int, Pin]]
     :param      ctrl_pin:    The control pin
     :type       ctrl_pin:    int
     :param      uart_id:     The ID of the used UART
@@ -53,7 +53,7 @@ def __init__(self,
                  data_bits: int = 8,
                  stop_bits: int = 1,
                  parity: Optional[int] = None,
-                 pins: List[int, int] = None,
+                 pins: List[Union[int, Pin], Union[int, Pin]] = None,
                  ctrl_pin: int = None,
                  uart_id: int = 1):
         super().__init__(
@@ -76,7 +76,7 @@ def __init__(self,
                  data_bits: int = 8,
                  stop_bits: int = 1,
                  parity=None,
-                 pins: List[int, int] = None,
+                 pins: List[Union[int, Pin], Union[int, Pin]] = None,
                  ctrl_pin: int = None):
         """
         Setup Serial/RTU Modbus
@@ -92,7 +92,7 @@ def __init__(self,
         :param      parity:      The parity, default None
         :type       parity:      Optional[int]
         :param      pins:        The pins as list [TX, RX]
-        :type       pins:        List[int, int]
+        :type       pins:        List[Union[int, Pin], Union[int, Pin]]
         :param      ctrl_pin:    The control pin
         :type       ctrl_pin:    int
         """