updated markdown references in notes plugin

plugin/notes-server/notes.html

@@ -99,7 +99,7 @@
 		<div id="notes"></div>
 
 		<script src="/socket.io/socket.io.js"></script>
-                <script src="/lib/js/showdown.js"></script>
+		<script src="/plugin/markdown/showdown.js"></script>
 
 		<script>
 		var socketId = '{{socketId}}';