fix: threads multi-compiler

[ricardogobbosouza]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Resolve #56

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #69 (78307ea) into master (f819203) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #69   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          240       242    +2     
  Branches        66        67    +1     
=========================================
+ Hits           240       242    +2     

Impacted Files	Coverage Δ
src/getESLint.js	100.00% <100.00%> (ø)
src/index.js	100.00% <100.00%> (ø)
src/linter.js	100.00% <100.00%> (ø)

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