added term official (#7)

Author: dcuartielles

README.adoc

@@ -2,7 +2,7 @@
 
 image:https://github.com/arduino-libraries/Arduino_MKRRGB/workflows/Compile%20Examples/badge.svg["Compile Examples Status", link="https://github.com/arduino-libraries/Arduino_MKRRGB/actions?workflow=Compile+Examples"] image:https://github.com/arduino-libraries/Arduino_MKRRGB/workflows/Spell%20Check/badge.svg["Spell Check Status", link="https://github.com/arduino-libraries/Arduino_MKRRGB/actions?workflow=Spell+Check"]
 
-Allows you to draw on your MKR RGB shield. Depends on the ArduinoGraphics library.
+Allows you to draw on your official Arduino MKR RGB shield. Depends on the ArduinoGraphics library.
 
 For more information about this library please visit us at https://www.arduino.cc/en/Reference/ArduinoMKRRGB