chore(readme): Add C6 to supported platforms

Author: tyeth

README.md

@@ -20,7 +20,7 @@ You will need a **free** [Adafruit IO](https://io.adafruit.com) account to use W
 
 |Platform| MCU(s) |
 |--|--|
-|[ESP32-x](https://github.com/espressif/arduino-esp32)| ESP32, ESP32-Sx, ESP32-C3 |
+|[ESP32-x](https://github.com/espressif/arduino-esp32)| ESP32, ESP32-Sx, ESP32-C3, ESP32-C6 |
 |[ESP8266](https://github.com/esp8266/Arduino)| ESP8266 |
 |[RP2040](https://github.com/earlephilhower/arduino-pico)| RP2040 MCU w/WiFi (i.e: Pico W) |
 |[RP2350](https://github.com/earlephilhower/arduino-pico)| RP2350 MCU w/WiFi (i.e: Pico 2W) |