Update README.md

Author: Jason2866

README.md

@@ -13,7 +13,7 @@ cd esp32-arduino-lib-builder
 ### Development builds
 Look in release and download a version. The day of build is using the commits of this day of IDF / Arduino.
 
-### Stable Release including ESP32solo1
+### Stable Platformio Platform release including ESP32solo1
 based on Arduino Core 2.0.5 and can be used with Platformio for the ESP32/ESP32solo1, ESP32C3, ESP32S2 and ESP32S3
 ```                  
 [platformio]