Add getISOCurrencies

[ricardogobbosouza]

Resolve #110

[codecov]

Codecov Report

Merging #118 (d897793) into main (d37ceea) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #118   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       132       135    +3     
===========================================
  Files             14        14           
  Lines            291       295    +4     
===========================================
+ Hits             291       295    +4     

Impacted Files	Coverage Δ
src/CurrenciesTrait.php	100.00% <100.00%> (ø)

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