Auto import css for css prop

[emmatown]

What:

Why:

How:

Checklist:

• Documentation
• Tests
• Code complete

[codecov-io]

Codecov Report

Merging #200 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
+ Coverage   90.82%   90.91%   +0.09%     
==========================================
  Files          22       22              
  Lines         850      859       +9     
  Branches      220      224       +4     
==========================================
+ Hits          772      781       +9     
  Misses         63       63              
  Partials       15       15

Impacted Files	Coverage Δ
src/css-prop.js	100% <100%> (ø)	⬆️
src/babel.js	98.07% <100%> (+0.07%)	⬆️

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