Update library.properties

There is a problem with the Arduino IDE's library manager, possibly related to this file.

Author: jasontwinters

library.properties

@@ -6,4 +6,4 @@ sentence=ThingSpeak Communication Library for Arduino & ESP8266
 paragraph=ThingSpeak ( https://www.thingspeak.com ) is an analytic IoT platform service that allows you to aggregate, visualize and analyze live data streams in the cloud.
 category=Communication
 url=https://www.thingspeak.com/
-architectures=avr,esp8266,samd,sam
+architectures=avr,esp8266