Describe build in less fluffy terms

Author: gaearon

README.md

@@ -100,8 +100,9 @@ Builds the app for production to the `build` folder.<br>
 It correctly bundles React in production mode and optimizes the build for the best performance.
 
 The build is minified and the filenames include the hashes.<br>
-A [service worker](https://developers.google.com/web/fundamentals/getting-started/primers/service-workers) using an [offline-first caching strategy](https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#cache-falling-back-to-network) is automatically generated.<br>
-Your ([progressive web](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#making-a-progressive-web-app)) app is ready to be deployed
+By default, it also [includes a service worker](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#making-a-progressive-web-app) so that your app loads from local cache on future visits.
+
+Your app is ready to be deployed.
 
 ## User Guide