[#547] add apache license comment

src/test/java/com/corundumstudio/socketio/transport/WebSocketTransportTest.java

@@ -1,8 +1,17 @@
 /*
  * @(#)WebSocketTransportTest.java 2018. 5. 23.
+ * 
+ * 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
  *
- * Copyright 2018 NAVER Corp. All rights Reserved. NAVER PROPRIETARY/CONFIDENTIAL. Use is subject to
- * license terms.
+ *    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.
  */
 package com.corundumstudio.socketio.transport;