fix: logic for extracting and preserving comments

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

Fix logic for extracting and preserving comments

Breaking Changes

Potentially yes, but previously behavior was be invalid:

• you can't preserve comments when use extractComment without condition
• you can't disable preserve and extract comments
• in some cases preserve always was some and you can't disable this

Some of bugs are very not convenient and cause problems with setup, also comments is not break code so we mark this as patch release.

Additional Info

No

[codecov]

Codecov Report

Merging #166 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #166   +/-   ##
=======================================
  Coverage   99.36%   99.36%           
=======================================
  Files           5        5           
  Lines         313      313           
  Branches      123      125    +2     
=======================================
  Hits          311      311           
  Misses          2        2

Impacted Files	Coverage Δ
src/index.js	99.45% <ø> (-0.01%)	⬇️
src/minify.js	100% <100%> (ø)	⬆️

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