Kalman RSI

This is a simplified version of Kalman RSI by onegreencandle.

Simplifications:

• It shows the indicator for a single configurable length with a default of 14.
  
• It does not color by region.
  
• It allows selecting the source, with a default of close. The version by onegreencandle uses ohlc4 instead. Note that both versions also use high and low.
  
• It uses the newer version (5) of Pine Script.
  
• It sets bands at 85 and 15.
  

リリースノート:

Chart update.

リリースノート:

Changed the indicator title and shorttitle to distinguish them from another possible implementation of Kalman RSI. In this implementation, the normal RSI is computed effectively over the Kalman MA.