Add support for sugar css file extensions

[sabarasaba]

💃

[codecov-io]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #9   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          31     31           
  Branches        4      4           
=====================================
  Hits           31     31

Impacted Files	Coverage Δ
src/utils.js	100% <100%> (ø)	⬆️

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[diegohaz]

Thanks, @sabarasaba 😊