Fix index out of range error

TheKitty · web-flow · commit 79803003e850 · 2022-11-30T11:12:04.000-05:00
diff --git a/Trinket_Ultrasonic_Rangefinder/README.md b/Trinket_Ultrasonic_Rangefinder/README.md
@@ -2,3 +2,5 @@
 
 Code to accompany this tutorial:
 https://learn.adafruit.com/trinket-ultrasonic-rangefinder
+
+Currently limited to M0 versions due to an issue in the Arduino IDE
