Update README.md

Remove donation button

Author: Pithikos

README.md

@@ -12,10 +12,6 @@ Notice that this implementation does not support the more advanced features
 like SSL etc. The project is focused mainly on making it easy to run a
 websocket server for prototyping, testing or for making a GUI for your application.
 
-If this project reduced your development time feel free to buy me a coffee.
-
-[![Donate](https://www.paypal.com/en_US/i/btn/x-click-but21.gif)](https://www.paypal.me/seferidis)
-
 
 Usage
 =======================