text: Title: stoch - fastk - fastd values
  Body: trying to get fastk and fastd values from stoch indicator - the talib code is below, how can I get them in pandas-ta
  
  ```python
  self.stoch=bt.talib.STOCHF(self.data.high, self.data.low, self.data.close, fastk_period=10, slowk_period=4, slowd_period=4)
  self.fastk=self.stoch.fastk
  self.fastd=self.stoch.fastd
  ```