feat(svgr-loader): include Babel transformation

[gregberge]

Closes #45

[codecov]

Codecov Report

Merging #48 into master will increase coverage by 0.7%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #48     +/-   ##
=========================================
+ Coverage   45.56%   46.27%   +0.7%     
=========================================
  Files          22       19      -3     
  Lines         237      255     +18     
  Branches       56       52      -4     
=========================================
+ Hits          108      118     +10     
- Misses        100      116     +16     
+ Partials       29       21      -8

Impacted Files	Coverage Δ
src/webpack.js	100% <100%> (+100%)	⬆️
src/h2x/toReactNative.js	76.92% <0%> (-1.65%)	⬇️
src/cli/fileCommand.js	0% <0%> (ø)	⬆️
src/h2x/expandProps.js	100% <0%> (ø)	⬆️
src/cli/index.js	0% <0%> (ø)	⬆️
src/h2x/emSize.js	100% <0%> (ø)	⬆️
src/plugins/h2x.js
src/plugins/prettier.js
src/plugins/transform.js
src/h2x/svgRef.js	12.5% <0%> (+1.38%)	⬆️
... and 3 more

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