switch license from MIT to Apache 2.0

plugin.xml

@@ -1,6 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<plugin xmlns="http://www.phonegap.com/ns/plugins/1.0"
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+<plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
     id="cordova-plugin-screen-orientation"
     version="1.4.0">