Update README.md

Author: David-Desmaisons

README.md

@@ -1,5 +1,5 @@
-# Vue.Draggable
-
+<p align="center"><img width="100"src="https://raw.githubusercontent.com/SortableJS/Vue.Draggable/master/logo.png"></p>
+<h1 align="center">Vue.Draggable</h1>
 
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