Upadte documentation + improve pre-publish

Author: David-Desmaisons

README.md

@@ -63,9 +63,9 @@ npm i -S vuedraggable
 
 <script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.min.js"></script>
 <!-- CDNJS :: Sortable (https://cdnjs.com/) -->
-<script src="//cdn.jsdelivr.net/npm/sortablejs@1.7.0/Sortable.min.js"></script>
+<script src="//cdn.jsdelivr.net/npm/sortablejs@1.8.3/Sortable.min.js"></script>
 <!-- CDNJS :: Vue.Draggable (https://cdnjs.com/) -->
-<script src="//cdnjs.cloudflare.com/ajax/libs/Vue.Draggable/2.17.0/vuedraggable.min.js"></script>
+<script src="//cdnjs.cloudflare.com/ajax/libs/Vue.Draggable/2.18.1/vuedraggable.umd.min.js"></script>
 
 ```