Std improvements

[rene-post]

Describe Request

Volatility: Standard Deviation (Std)

Change Type

Performance improvements.

[codecov-commenter]

Codecov Report

Merging #104 (1e3b406) into master (6b80892) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   57.35%   57.42%   +0.06%     
==========================================
  Files          13       13              
  Lines        1217     1219       +2     
==========================================
+ Hits          698      700       +2     
  Misses        511      511              
  Partials        8        8              

Impacted Files	Coverage Δ
volatility_indicators.go	55.96% <100.00%> (+0.82%)	⬆️

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[cinar]

Thank you very much for sending it! It looks great. If you don't mind, I'll rename with Std function as StdFromSma and I'll have the Std to use that, so that Std can still be used without the sma. This is now very well optimized, thank you!

[cinar]

Available in release v1.2.23