Commits on Jul 8, 2023

1. [GH-169] Add Psychological Line (PSL) Support …

   The Psychological Line indicator is the ratio of the number of
   rising periods over the total number of periods.
   
   https://library.tradingtechnologies.com/trade/chrt-ti-psychological-line.html
   
   Formular:
   * PSL = (Number of Rising Periods) / (Total Number of Periods) * 100
   
   Example:
   * `df['psl']` retrieves the PSL with default window 12.
   * `df['psl_10']` retrieves the PSL with window 10.
   * `df['high_12_psl']` retrieves the PSL of high price with window 10.

   

   jealous committed Jul 8, 2023
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