Adding ESP8266 to the list of supported architectures (#87)

Author: aentinger

Diff for: library.properties

@@ -6,6 +6,6 @@ sentence=This library allows to connect to the Arduino IoT Cloud service.
 paragraph=It provides a ConnectionManager to handle connection/disconnection, property-change updates and events callbacks. The supported boards are MKRGSM, MKR1000 and WiFi101.
 category=Communication
 url=https://github.com/arduino-libraries/ArduinoIoTCloud
-architectures=samd
+architectures=samd,esp8266
 includes=ArduinoIoTCloud.h
 depends=Arduino_ConnectionHandler,Arduino_DebugUtils,ArduinoCloudThing,ArduinoMqttClient,ArduinoBearSSL,ArduinoECCX08,RTCZero