Fixing out-dated license header

git-svn-id: https://svn.apache.org/repos/asf/mina/ftpserver/trunk@1001607 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/main/java/org/apache/ftpserver/util/OS.java b/core/src/main/java/org/apache/ftpserver/util/OS.java
index a1a90c5..952c8fa 100644
--- a/core/src/main/java/org/apache/ftpserver/util/OS.java
+++ b/core/src/main/java/org/apache/ftpserver/util/OS.java
@@ -1,18 +1,20 @@
-/* 
- * Copyright 2005  The Apache Software Foundation
+/*
+ * 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
  *
- *  Licensed 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
  *
- *      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.
- *
+ * 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.
  */
 
 package org.apache.ftpserver.util;