Minor copyright fix.

Red-M · Red-M · commit e70de9f56e63 · 2021-04-28T20:09:42.000+10:00
diff --git a/adafruit_mcp230xx/mcp230xx.py b/adafruit_mcp230xx/mcp230xx.py
@@ -1,5 +1,6 @@
 # SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
 # SPDX-FileCopyrightText: 2019 Carter Nelson
+# SPDX-FileCopyrightText: 2021 Red_M
 #
 # SPDX-License-Identifier: MIT
 
@@ -9,7 +10,7 @@
 
 CircuitPython module for the MCP23017 and MCP23008 I2C I/O extenders.
 
-* Author(s): Tony DiCola
+* Author(s): Tony DiCola, Red_M (2021)
 """
 
 from .mcp23xxx import MCP23XXX
