text: Title: STC not working
  Body: **Which version are you running? The lastest version is on Github. Pip is for major releases.**
  ```python
  
  0.3.14b0
  ```
  
  
  **Describe the bug**
  KeyError: 1
  
  **To Reproduce**
  Provide sample code.
  df.ta.stc(append=True)
  
  **Expected behavior**
  Should work without crashing
  
  **Screenshots**
  If applicable, add screenshots to help explain your problem.
  
  **Additional context**
  You are not converting pd.series to list. Converting series to list will fix the problem
  
  Thanks for using Pandas TA!
  