Update PWA link in README (#5907)

Author: wuweiweiwu

README.md

@@ -148,7 +148,7 @@ Your environment will have everything you need to build a modern single-page Rea
 - A fast interactive unit test runner with built-in support for coverage reporting.
 - A live development server that warns about common mistakes.
 - A build script to bundle JS, CSS, and images for production, with hashes and sourcemaps.
-- An offline-first [service worker](https://developers.google.com/web/fundamentals/getting-started/primers/service-workers) and a [web app manifest](https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/), meeting all the [Progressive Web App](https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#making-a-progressive-web-app) criteria. (_Note: Using the service worker is opt-in as of `react-scripts@2.0.0` and higher_)
+- An offline-first [service worker](https://developers.google.com/web/fundamentals/getting-started/primers/service-workers) and a [web app manifest](https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/), meeting all the [Progressive Web App](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app) criteria. (_Note: Using the service worker is opt-in as of `react-scripts@2.0.0` and higher_)
 - Hassle-free updates for the above tools with a single dependency.
 
 Check out [this guide](https://github.com/nitishdayal/cra_closer_look) for an overview of how these tools fit together.