recommend using SRI hashes and crossover attributes (#647)

Mithgol · eltonmesquita · commit c420b285ceeb · 2017-07-10T17:11:44.000-03:00
diff --git a/README.md b/README.md
@@ -24,10 +24,20 @@ $ npm install animate.css --save
     <link rel="stylesheet" href="animate.min.css">
   </head>
   ```
-  or use the version hosted by [CDNJS](https://cdnjs.com/libraries/animate.css)
+  Instead of installing you may use the remote version (hosted by [CDNJS](https://cdnjs.com/libraries/animate.css)):
   ```html
   <head>
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.5.2/animate.min.css">
+    <link rel="stylesheet"
+    href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.5.2/animate.min.css">
+  </head>
+  ```
+  You may [generate a SRI hash](https://www.srihash.org/) of that particular version and then use it to ensure the file's integrity; also you can make anonymous requests to CDN by setting the corresponding [`crossorigin`](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes) attribute:
+  ```html
+  <head>
+    <link rel="stylesheet"
+    href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.5.2/animate.min.css"
+    integrity="sha384-OHBBOqpYHNsIqQy8hL1U+8OXf9hH6QRxi0+EODezv82DfnZoV7qoHAZDwMwEJvSw"
+    crossorigin="anonymous">
   </head>
   ```
 2. Add the class `animated` to the element you want to animate.
