react-smooth v4.0.0

What's Changed

BREAKING CHANGES

• react-smooth v4 "breaking changes" by @ckifer in https://github.com/recharts/react-smooth/pull/87
  • drop support for React < 16.8
  • upgrade react-transition-group to 4.x
  • move prop-types to dependencies so it doesn't have to be included by the consumer
    • remove from webpack externals

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• Upgrade prop-types
• Upgrade some dev dependencies

Full Changelog: https://github.com/recharts/react-smooth/compare/v3.0.0...v4.0.0