Update fastpin_apollo3.h
Update fastpin_apollo3.h

Add support for Artemis Dev Kit
Still only supporting the Artemis Arduino core v1.2.1
PaulStoffregen/FastLED,FastLED/FastLED,PaulStoffregen/FastLED,FastLED/FastLED,FastLED/FastLED,PaulStoffregen/FastLED,FastLED/FastLED