fix splitChunks support

[sokra]

fixes #13

[codecov]

Codecov Report

Merging #20 into master will not change coverage.
The diff coverage is 0%.

@@         Coverage Diff          @@
##           master   #20   +/-   ##
====================================
  Coverage       0%    0%           
====================================
  Files           3     3           
  Lines         151   156    +5     
  Branches       31    32    +1     
====================================
- Misses        120   124    +4     
- Partials       31    32    +1

Impacted Files	Coverage Δ
src/index.js	0% <0%> (ø)	⬆️

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