change jquery to 3.3.1

Author: swashata

index.html

@@ -12,7 +12,7 @@
 	<link rel="stylesheet" type="text/css" href="lib/css/shCoreDefault.css" />
 
 	<!-- jQuery -->
-	<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
+	<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
 
 	<!-- Demo Scripts -->
 	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>