0.0.0
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 - Initial version

0.1.0
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 - Refactor output to {} structure,
   as opposed to using Model class instances.

0.1.1
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 - Corrections to README

0.2.0
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 - Added support for polygon groups

0.3.0
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 - Added support for smoothing groups

0.4.0
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 - Setup babel to transpile JS to ES5

0.5.0
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 - Introduce linter (eslint)