Require without file extension #397

[tripodsan]

see #397

[codecov]

Codecov Report

Merging #602 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #602      +/-   ##
==========================================
+ Coverage   85.33%   85.34%   +<.01%     
==========================================
  Files          38       38              
  Lines        1889     1890       +1     
  Branches      268      268              
==========================================
+ Hits         1612     1613       +1     
  Misses        277      277

Impacted Files	Coverage Δ
src/parcel/RawJSPackager.js	86.15% <100%> (+0.21%)	⬆️

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