Updated xml schema

plugin.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<plugin xmlns="http://www.phonegap.com/ns/plugins/1.0"
+<plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
+        xmlns:android="http://schemas.android.com/apk/res/android"
         id="de.appplant.cordova.plugin.local-notifications"
         version="0.4.0">