Update README.md

Author: dani007200964

README.md

@@ -1,14 +1,15 @@
 ## Commander-API library
-**Version V2.1.0**
+**Version V2.1.1**
 
 Commander-API is a simple-to-use parser library, and you can easily use it to process character based commands and link them to a specified function. It is designed mainly to work with low memory capacity devices, for example, __small ARM or AVR processors__.
 
-__Key changes in V2.1.0:__
+__Key changes in V2.1.1:__
 * AVR PROGMEM support.
 * Piping
 * Ready to use built-in commands
+* Fixes compatibility with Risc-V based ESP32 platforms
 
-__Breaking changes in V2.1.0:__
+__Breaking changes in V2.1.1:__
 * The response channel is now uses the Stream class.
   This way it is more flexible and you doesn't have to
   create a class for every peripheral.
@@ -29,7 +30,7 @@ The full documentation can be found [here](https://dani007200964.github.io/Comma
 ## Donation
 If this project help you reduce time to develop, you can give me a cup of coffee :coffee: :coffee: :coffee:
 
-[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/donate?hosted_button_id=YFGZD78H6K2CS)
+[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://ko-fi.com/danielhajnal)
 
 ## License & copyright
 © Daniel Hajnal