N_sma_threshhold should be instance variable

[ohmorimori]

Thank you for the great implementation.
I think I found a small part to modify at ranger.py line 116.

original code:
if N_sma > N_sma_threshhold:

to be left:
if N_sma > self.N_sma_threshhold:

[lessw2020]

Hi @ohmorimori - you are correct, ,thanks for pointing this out.
That is my mistake for not running the code, I just fixed in here directly b/c it was "so simple".
I'm running the correction now and will check it in.

[lessw2020]

Fixed - thanks again!