feat: Add option to use EMA for RSI calculation

[bennycode]

No description provided.

[codecov-commenter]

Codecov Report

Merging #70 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #70   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          232       236    +4     
  Branches        31        32    +1     
=========================================
+ Hits           232       236    +4     

Flag	Coverage Δ
#unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/RSI/RSI.ts	100.00% <100.00%> (ø)
src/SMMA/SMMA.ts	100.00% <100.00%> (ø)

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