Update library.properties

Fix INCOMPATIBLE listing in Example menu by changing architecture.

Author: ClemensAtElektor

library.properties

@@ -6,5 +6,5 @@ sentence=ATmega4809 core-independent driver for WS2812B addressable RGB LEDs.
 paragraph=No bit-banging, the communication protocol is handled by hardware peripherals, saving lots of CPU cycles.
 category=Display
 url=https://github.com/ClemensAtElektor/Nano_Every_WS2812B
-architectures=avr
+architectures=megaavr
 includes=Nano_Every_WS2812B.h