https://github.com/facebook/create-react-app/pull/5097

Regenerator is already included by preset-env.

Fixes #4627

* changed to Migrate to v2.x

* richer explanation

* Update README.md

 - babel-plugin-named-asset-import@0.2.0
 - babel-preset-react-app@4.0.0
 - confusing-browser-globals@1.0.1
 - create-react-app@2.0.0
 - eslint-config-react-app@3.0.0
 - react-app-polyfill@0.1.0
 - react-dev-utils@6.0.0
 - react-error-overlay@5.0.0
 - react-scripts@2.0.0

* Tweak browser support section

* Make sass message friendlier

* Tweak message

* Tweak message futher

* test

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

This reverts commit 11f1aa09.

* add kitchensink-eject to local-test

* add jest transform

Closes https://github.com/facebook/create-react-app/issues/5095

* Turn on helpers and test importing something with async/await works

* Compiling babel runtime breaks itself

* Add helpers option to babel plugin with defaults

* Make helpers off by default and on in our configuration

* Hit eject and e2e

* meh

* copy'n'paste

* change again

* Turn off helpers by default in /prod, /dev, /test

* oops

* Spread undefined

* Use object assign not object spread

* Put preset in template since it's needed

* Fix e2e tests

* Drop ie 11 support and move polyfills to a new package

* More useful directions for what entry point to use
https://github.com/facebook/create-react-app/pull/5090#discussion_r220313783

* Clear up what file this polyfill goes in
https://github.com/facebook/create-react-app/pull/5090#discussion_r220313980

* Polyfill `window`, not `global`

* Remove proxy polyfill file

* Switch to stage 3 css

* Tweak default browsers, too

* add postcss-preset-env, remove autoprefixer

* limit to stage 4

* Add new overrides option

* Add file to package.json

* Create our own loader

* Remove overrides

* We have to use a real babel option

* Add comments

Closes https://github.com/facebook/create-react-app/issues/5081

Husky had an overhaul of the API, see https://github.com/typicode/husky
Therefore the usage advice here has been adjusted.

follwing -> following