update doc

docs/documentation.html

@@ -66,6 +66,7 @@
 				  	<p>In order to use jvenn, you need to import within your web page: </p>
 				  	<ul>
 				  		<li><a href="http://jquery.com/">jQuery v1.6.x or higher</a></li>
+				  		<li><a href="js/canvas2svg.js">canvas2svg.js</a></li>
 				  		<li><a href="js/jvenn.min.js">jvenn.min.js</a></li>
 				  	</ul>
 				  	<p>Take a peek at the code below, a single function call to initialise the venn diagram is all it takes:</p>