[2.x] fix: ignore file

[ricardogobbosouza]

This PR contains a:

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

Motivation / Use-Case

Files ignored in .stylelintignore when changed were going through lint

Breaking Changes

No

Additional Info

Stylelint has an api to check if the file is ignored isPathIgnored

[codecov]

Codecov Report

Merging #282 (f381203) into 2.x (1ccd8bf) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               2.x      #282   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          249       255    +6     
  Branches        54        55    +1     
=========================================
+ Hits           249       255    +6     

Impacted Files	Coverage Δ
src/getStylelint.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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