docs(README): add notice about older jQuery versions

Author: thgreasi

README.md

@@ -10,8 +10,8 @@ This directive allows you to sort an array with drag & drop.
 
 ## Requirements
 
-- JQuery
-- JQueryUI 1.9+
+- JQuery v3.1+ (for jQuery v1.x & v2.x use [v0.14.x versions](https://github.com/angular-ui/ui-sortable/tree/v0.14.x-stable))
+- JQueryUI v1.12+
 - AngularJS v1.2+
 
 [Single minified cdn link](http://cdn.jsdelivr.net/g/jquery@1,jquery.ui@1.10%28jquery.ui.core.min.js+jquery.ui.widget.min.js+jquery.ui.mouse.min.js+jquery.ui.sortable.min.js%29,angularjs@1.2,angular.ui-sortable) ~245kB and [example](http://codepen.io/thgreasi/pen/olDJi) with JQuery v1.x, required parts of JQueryUI v1.10, AngularJS v1.2 & latest angular-ui-sortable.