refactor!: webpack v4 and nodejs v10 dropped

[ricardogobbosouza]

Resolve #82, #101

This PR contains a:

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

Motivation / Use-Case

• Webpack v4 dropped
• Node.js v10 dropped

Breaking Changes

• Webpack v4 dropped
• Node.js v10 dropped

Additional Info

No

[codecov]

Codecov Report

Merging #105 (2e5ee72) into master (7e96c87) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #105   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          251       251           
  Branches        73        73           
=========================================
  Hits           251       251           

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

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