text: Title: Type stubs
  Body: **Which version are you running? The lastest version is Github. Pip is for major releases.**
  0.3.14b
  
  **Is your feature request related to a problem? Please describe.**
  Python is ever more growing towards typing. Even major projects like Pandas, Numpy, Matplotlib have added typing hinting to the projects and made type stubs available to developers. For my job, or when I create a serious project, I ensure my code is type safe. While my type checker can infer some return types from the library, the input types are always unknown.
  
  **Describe the solution you'd like**
  Progressively add type hints to the code base and generate type stubs to be made available to developers using pandas_ta.
  