Add rollup to create browser compatible version

[qw-in]

I'm not sure if there is interest but I needed a browser compatible version so threw together a rollup config quickly. If there is interest happy to work on cleaning it up.

Thanks for the great library by the way!

[codecov[bot]]

Codecov Report

Merging #12 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #12   +/-   ##
=======================================
  Coverage   93.65%   93.65%           
=======================================
  Files           1        1           
  Lines          63       63           
=======================================
  Hits           59       59           
  Misses          4        4           

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