Updating dataSource url to HTTPS

#22

Author: IvayloG

HTMLSamples/sparkline/bind-to-remote-data.html

@@ -35,7 +35,7 @@
         $(function () {
 
             $("#sparkline").igSparkline({
-                dataSource: "http://igniteui.com/api/invoices?callback=?",
+                dataSource: "https://igniteui.com/api/invoices?callback=?",
                 responseDataKey: "d.results",
                 height: "100px",
                 width: "100%",