Change polyfill link to our package

Author: Timer

template/README.md

@@ -221,7 +221,7 @@ Learn more about [different proposal stages](https://babeljs.io/docs/plugins/#pr
 
 While we recommend using experimental proposals with some caution, Facebook heavily uses these features in the product code, so we intend to provide [codemods](https://medium.com/@cpojer/effective-javascript-codemods-5a6686bb46fb) if any of these proposals change in the future.
 
-Note that **this project includes no [polyfills](https://en.wikipedia.org/wiki/Polyfill)** by default.
+Note that **this project includes no [polyfills](https://github.com/facebook/create-react-app/blob/next/packages/react-app-polyfill/README.md)** by default.
 
 If you use any other ES6+ features that need **runtime support** (such as `Array.from()` or `Symbol`), make sure you are including the appropriate polyfills manually, or that the browsers you are targeting already support them.