update for v2 pin and v0.2.0 of the smart-leds crate

[jacobrosenthal]

I can't test the example as I don't have an m4, perhaps someone else can? Note this is only working for 1 led on the pygamer, so should be tested with more than 1 led to see if the problem is in this crate.

[jacobrosenthal]

The one led not even working anymore. I have a feeling timings are odd. Unwrapping definately takes instructions, I tried changing those out for let _ but that doesnt fix it
Do you know how many instructions delay is supposed to be on cortex m4? How did you land on those delay numbers?
If Im reading the adafruit library right adafruit/Adafruit_NeoPixel@a02a3c7
NEO_KHZ400
// ONE
// High 800ns
// Low 450ns
/ ZERO
// High 400ns
// Low 850ns

[sajattack]

If I recall correctly the numbers were the cycle delay used in circuitpython.