reduxjs/redux#2004 List features beyond ES6 supported by create-react-app

Author: jonathanconway

Diff for: packages/react-scripts/template/README.md

@@ -13,6 +13,7 @@ You can find the most recent version of this guide [here](https://github.com/fac
   - [npm test](#npm-test)
   - [npm run build](#npm-run-build)
   - [npm run eject](#npm-run-eject)
+- [Supported features beyond ES6](#supported-features-beyond-es6)
 - [Syntax Highlighting in the Editor](#syntax-highlighting-in-the-editor)
 - [Displaying Lint Output in the Editor](#displaying-lint-output-in-the-editor)
 - [Changing the Page `<title>`](#changing-the-page-title)
@@ -162,6 +163,14 @@ Instead, it will copy all the configuration files and the transitive dependencie
 
 You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
 
+## Supported Features Beyond ES6
+
+The following language features beyond ES6 are supported (at the time of writing, stage 2 and 3 proposals):
+
+* [Public class fields](https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-class-properties) ([stage 2](https://tc39.github.io/proposal-class-public-fields/))
+* [ES2015 parameters](https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-object-rest-spread) ([stage 3](https://babeljs.io/docs/plugins/transform-es2015-parameters/))
+* [Object rest spread](https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-object-rest-spread) ([stage 3](https://github.com/tc39/ecma262))
+
 ## Syntax Highlighting in the Editor
 
 To configure the syntax highlighting in your favorite text editor, head to the [relevant Babel documentation page](https://babeljs.io/docs/editors) and follow the instructions. Some of the most popular editors are covered.