text: Title: Pandas TA MACD not in line with TA Lib
  Body: pandas_ta not in line with talib probably because of wrong calculation of EMA9 for signal line (consequence of bug in EMA calculation, see above
  
  ![image](https://user-images.githubusercontent.com/22365509/126035795-6e224cc4-ca71-4e9c-810e-6134892486f1.png)
  