Error when setting pixel value to a list value (circuitpython 4.0.0beta)

[cpforbes]

When setting a pixel with a list for the value:

>>> import board
>>> import neopixel
>>> NUMPIXELS = 16
>>> neopixels = neopixel.NeoPixel(board.D4, NUMPIXELS, brightness=0.2, auto_write=False)
>>> neopixels[1] = [0,0,0]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "neopixel.py", line 169, in __setitem__
  File "neopixel.py", line 148, in _set_item
TypeError: unsupported types for __add__: 'list', 'tuple'

This appears to be from the tuple addition used here:

Adafruit_CircuitPython_NeoPixel/neopixel.py

Line 148 in 6e35cd2

r, g, b, w = value if len(value) == 4 else value+(0,)

[tannewt]

@cpforbes Want to try fixing it? I can help if you have any questions.

[cpforbes]

@tannewt Sure. Will work on a PR.

[tannewt]

Great! Thank you. Will review it now.