text: Title: could you add SMIIO?
  Body: Hi, twopirllc,
  I find that you maintain pandas-ta very diligent. Thank you for your work.
  I find a indicator is useful, SMIIO, SMI Ergodic Indicator/Oscillator.
  [https://www.tradingview.com/chart/LOCO/wsKsWzWo-Momentum-based-SMIIO-Indicator/](url)
  yes, I find  Stochastic in pandas-ta, I think  Stochastic is too sensitive.
  I tried to code SMIIO but not success.
  Could you add SMIIO to pandas-ta?