Update README.md

Author: Jason2866

README.md

@@ -35,13 +35,12 @@ ESP32 is a series of low-cost, low-power system on a chip microcontrollers with
 1. Configure a platform option in [platformio.ini](https://docs.platformio.org/page/projectconf.html) file:
 
 ### Stable version
-espressif Arduino 3.0.4 and IDF 5.1.4
 
 See `platform` [documentation](https://docs.platformio.org/en/latest/projectconf/sections/env/options/platform/platform.html#projectconf-env-platform) for details.
 
 ```ini
 [env:stable]
-platform = https://github.com/pioarduino/platform-espressif32/releases/download/51.03.04/platform-espressif32.zip
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
 board = ...
 ...
 ```