Update readme to esp32 and add links to V2.x.x repo

Author: glynhudson

readme.md

@@ -6,7 +6,9 @@
 
 ![main](docs/main2.png)
 
-The WiFi gateway uses an ESP8266 (ESP-12) which communicates with the OpenEVSE controller via serial utilizing the existing RAPI API serial interface. The web interface UI is served directly from the ESP8266 web server and can be controlled via a connected device over the network.
+The WiFi gateway uses an **ESP32** which communicates with the OpenEVSE controller via serial utilizing the existing RAPI API serial interface. The web interface UI is served directly from the ESP8266 web server and can be controlled via a connected device over the network.
+
+[**See this repo for the older V2.x ESP8266 version**](https://github.com/openevse/ESP8266_WiFi_v2.x/)
 
 Live demo: https://openevse.openenergymonitor.org