Go Report Card warning: "substract" is a misspelling of "subtract"

[cinar]

Describe Request

Go Report Card warning: "substract" is a misspelling of "subtract" (misspell)

Fixed #96

Change Type

Bug fix.

[codecov-commenter]

Codecov Report

Merging #97 (be38121) into master (bf9db3d) will not change coverage.
The diff coverage is 74.19%.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   56.00%   56.00%           
=======================================
  Files          13       13           
  Lines        1200     1200           
=======================================
  Hits          672      672           
  Misses        520      520           
  Partials        8        8           

Impacted Files	Coverage Δ
volatility_indicators.go	48.64% <40.00%> (ø)
momentum_indicators.go	20.00% <66.66%> (ø)
trend_indicators.go	80.25% <71.42%> (ø)
backtest.go	100.00% <100.00%> (ø)
helper.go	91.12% <100.00%> (ø)
volume_indicators.go	80.00% <100.00%> (ø)

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