readme.md updated

README.md

@@ -54,7 +54,8 @@ If your device has silicon **Unique ID** which is stored in serial EEPROM Microc
 
 # Building
 
-Use <A HREF="https://platformio.org/">PlatformIO</A> with your preferred IDE for development and building this code.
+Use <A HREF="https://platformio.org/">PlatformIO</A> with your preferred IDE for development and building this code. Make sure you have latest PlatformIO version, at least 
+<A HREF="https://community.platformio.org/t/platformio-core-3-5-3/4238?utm_source=platformio&utm_medium=piohome">v3.5.3</A>
 
 # Uploading
 

src/adcread.cpp

@@ -1,6 +1,7 @@
 #ifdef HAS_BATTERY_PROBE
 
 #include "globals.h"
+
 #include <driver/adc.h>
 #include <esp_adc_cal.h>