kdj bug: ZeroDivisionError: float division by zero , if high == low

[jiabier]

if high == low (say: high - low == 0.) in a row, df['kdj*'] raises exception: ZeroDivisionError: float division by zero. version: 0.6.2

[jealous]

Could you share the sample data frame? Just a few records that triggers the error will help.