Update library.properties

Author: bakercp

library.properties

@@ -6,4 +6,4 @@ sentence=A small, efficient library for sending serial data packets.
 paragraph=PacketSerial is an small, efficient, library that allows Arduinos to send and receive serial data packets that include bytes with any value (0-255).  A packet is simply an array of bytes.
 category=Communication
 url=https://github.com/bakercp/PacketSerial
-architectures=avr
+architectures=*