update README.md

README.md

@@ -23,7 +23,9 @@ yarn add @shaun/alpinejs-router
 
 ```html
 <script src="https://unpkg.com/@shaun/alpinejs-router@1.x.x/dist/cdn.min.js" defer></script>
+```
 
+```html
 <!-- older browsers -->
 <script src="https://unpkg.com/@shaun/alpinejs-router@1.x.x/dist/es6.min.js" defer></script>
 ```