Merge pull request #71 from adafruit/3v_trinket

adding targets to specify which trinket

Author: siddacious

build_platform.py

@@ -37,7 +37,8 @@
     "esp8266" : "esp8266:esp8266:huzzah:eesz=4M3M,xtal=80",
     "esp32" : "esp32:esp32:featheresp32:FlashFreq=80",
     # Adafruit AVR
-    "trinket" : "adafruit:avr:trinket5",
+    "trinket_3v" : "adafruit:avr:trinket3",
+    "trinket_5v" : "adafruit:avr:trinket5",
     "gemma" : "arduino:avr:gemma",
     "cpc" : "arduino:avr:circuitplay32u4cat",
     # Adafruit SAMD