Upgrade babel-preset-react-app to v2

[fstoerkle]

Upgrade babel-preset-react-app to version 2.x.x, which uses babel-preset-env instead of the deprecated babel-preset-latest.

This enables depending modules to get rid of the following warning on npm install (when using the @kadira/storybook module).

npm WARN deprecated [email protected]: 💥  preset-latest accomplishes the same task as babel-preset-env. 🙏  Please install it with 'npm install babel-preset-env --save-dev'. '{ "presets": ["latest"] }' to '{ "presets": ["env"] }'. For more info, please check the docs: http://babeljs.io/docs/plugins/preset-env 👌. And let us know how you're liking Babel at @babeljs on 🐦

[SavePointSam]

Haha. I just came here to post this!

[ndelangen]

@fstoerkle I want to thank you for your contribution! I'm working on a large shift in a new repo and have actually updated/upgraded every single dependency we have to the latest. So that includes babel, webpack everything. I hope you don't mind me closing this PR.

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