Add a link to supported features

Author: gaearon

README.md

@@ -101,6 +101,7 @@ The [User Guide](https://github.com/facebookincubator/create-react-app/blob/mast
 - [Updating to New Releases](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#updating-to-new-releases)
 - [Folder Structure](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#folder-structure)
 - [Available Scripts](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#available-scripts)
+- [Supported Language Features and Polyfills](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#supported-language-features-and-polyfills)
 - [Syntax Highlighting in the Editor](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#syntax-highlighting-in-the-editor)
 - [Displaying Lint Output in the Editor](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#displaying-lint-output-in-the-editor)
 - [Changing the Page `<title>`](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#changing-the-page-title)