Update README.md

Author: Luc

README.md

@@ -30,6 +30,7 @@ Arduino ide 1.8.4 with git version from ESP8266 or ESP32 : [![Build Status](http
 * to Roy Cortes from http://www.panucatt.com for supporting and pushing me implementing great features
 * to all contributors, feedbacks owners and donations.
 
+## Donate
 Every support is welcome: [<img src="https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG_global.gif" border="0" alt="PayPal – The safer, easier way to pay online.">](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Y8FFE7NA4LJWQ)    
 Especially if need to buy new modules for testing.