Add mbed_nano and mbed_portenta as supported architectures. (#33)

Author: aentinger

library.properties

@@ -6,5 +6,5 @@ sentence=Arduino Library for the Atmel/Microchip ECC508 and ECC608 crypto chips
 paragraph=
 category=Communication
 url=https://github.com/arduino-libraries/ArduinoECCX08
-architectures=samd,megaavr,mbed
+architectures=samd,megaavr,mbed,mbed_nano,mbed_portenta
 includes=ArduinoECCX08.h