restored browser script include to readme

Author: gmsa

README.md

@@ -77,7 +77,9 @@ Import the library
 
 Include the browser-ready bundle (download from [releases](https://github.com/jbaysolutions/vue-grid-layout/releases)) in your page. The components will be automatically available.
 
-
+```html
+    <script src="vue-grid-layout.umd.min.js"></script>
+```
 
 ### Usage