Update react-transition-group to the latest version 🚀

[greenkeeper]

The devDependency react-transition-group was updated from 2.9.0 to 3.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[codecov-io]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #11   +/-   ##
=======================================
  Coverage   96.87%   96.87%           
=======================================
  Files          22       22           
  Lines         735      735           
  Branches      154      154           
=======================================
  Hits          712      712           
  Misses         23       23

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[greenkeeper]

• The devDependency react-transition-group was updated from 2.9.0 to 4.0.0.

Update to this version instead 🚀

Release Notes for v4.0.0

4.0.0 (2019-04-16)

Features

• support esm via package.json routes (#488) (6337bf5), closes #77

BREAKING CHANGES

• in environments where esm is supported importing from commonjs requires explicitly adding the .default after require() when resolving to the esm build