Update README.md

Fixed Buy Me a Coffee button

Author: Alexwijn

README.md

@@ -9,8 +9,9 @@
 
 **Your support for the countless hours we've dedicated to this development is greatly appreciated, though not required**
 
-
-<a href="https://www.buymeacoffee.com/alexwijn"><img src="https://img.buymeacoffee.com/button-api/?text=Buy me a coffee&emoji=&slug=alexwijn&button_colour=0ac982&font_colour=000000&font_family=Cookie&outline_colour=000000&coffee_colour=ffffff"></a>
+<a href="https://www.buymeacoffee.com/alexwijn" target="_blank">
+   <img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 40px !important;" >
+</a>
 
 ![opentherm-mqtt.png](https://raw.githubusercontent.com/Alexwijn/SAT/develop/.github/images/opentherm-mqtt.png)
 ![overshoot_protection.png](https://raw.githubusercontent.com/Alexwijn/SAT/develop/.github/images/overshoot_protection.png)