text: Title: Vidya indicator calculated results are not same as tradingview
  Body: **Which version are you running? 
  The last version : (from python-dateutil>=2.8.1->pandas->pandas-ta==0.3.14b0)
  
  **Is your feature request related to a problem? Please describe.**
  The result of vidya function  ta.vidya(df["Close"],length=7).iloc[-1] not equal with tradingview
  ![vidya](https://user-images.githubusercontent.com/66446463/172468561-fb013491-4bbf-4afb-8f6a-d0ce3cbc52d6.jpg)
  
  
  **Describe the solution you'd like**
  Fix vidya indicator results to be same as tradingview please
  vidya indicator in tradingview(https://www.tradingview.com/script/hdrf0fXV-Variable-Index-Dynamic-Average-VIDYA/) is same as you mentioned source in your vidya.py with same timeframe, length but results are not match
  
  Thanks
  