Merge pull request #122 from FoamyGuy/rainbowcommet_256_length_fix

rainbow commet fix for tail_length > 256

adafruit_led_animation/animation/rainbowcomet.py

@@ -60,7 +60,7 @@ def __init__(
         ring=False,
     ):
         if step == 0:
-            self._colorwheel_step = int(256 / tail_length)
+            self._colorwheel_step = max(256 // tail_length, 1)
         else:
             self._colorwheel_step = step
         self._colorwheel_offset = colorwheel_offset