fix: use better micromatch extglobs

[bahmannejati]

This PR contains a:

• bugfix
• typo fix

Motivation / Use-Case

It seems that the default value for the files option has an issue.
If the purpose of **/*.s?(c|a)ss is to match just scss or sass files so why we need ? after s
I think the **/*.(s(c|a)ss|css) is better for supporting css, scss & sass files.

[jsf-clabot]

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[codecov-commenter]

Codecov Report

Merging #216 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #216   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          125       125           
  Branches        25        25           
=========================================
  Hits           125       125           

Impacted Files	Coverage Δ
src/getOptions.js	100.00% <ø> (ø)

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[ricardogobbosouza]

Thanks @bahmannejati

[tagliala]

Hi,

I think this can be considered a breaking change, my builds break with 2.1.1

Also the readme should be updated to reflect this change

[icatalina]

Hi @ricardogobbosouza! Could we please revert this and release it as a breaking change. An npm audit is breaking all our builds.

Thanks!