Implement the JED update.xml (joomla-extensions#268)

* add jed_update.xml

* get rid of the wrong method

Author: zero-24

jed_update.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<jedupdate version="1">
+	<core_body>The Web Links Manager allows you to add, edit and remove links to other web sites on your Joomla! web site, and organize them into categories. You can then display these links on your site, and optionally let visitors add new links.</core_body>
+	<!-- valid links only or leave blank -->
+	<homepage_link>https://github.com/joomla-extensions/weblinks</homepage_link>
+	<download_link>https://github.com/joomla-extensions/weblinks/releases</download_link>
+	<demo_link>https://demo.joomla.org/</demo_link>
+	<documentation_link>https://docs.joomla.org/Help33:Components_Weblinks_Links</documentation_link>
+	<support_link>http://forum.joomla.org/</support_link>
+	<license_link>http://opensourcematters.org/legal/license-copyright/gnu-general-public-license-v2.html</license_link>
+	<version>3.5.0</version>
+	<compatibility>
+		<version>35</version>
+		<version>36</version>
+		<version>37</version>
+	</compatibility>
+</jedupdate>