feat: Update copyright headers on all java files

Resolves #4 (closed)

src/main/java/org/eclipsefoundation/mailing/api/AccountsAPI.java

-/*******************************************************************************
- * Copyright (C) 2020 Eclipse Foundation
- * 
- * This program and the accompanying materials are made
- * available under the terms of the Eclipse Public License 2.0
- * which is available at https://www.eclipse.org/legal/epl-2.0/
- * 
- * SPDX-License-Identifier: EPL-2.0
- ******************************************************************************/
+/*********************************************************************
+* Copyright (c) 2020 Eclipse Foundation.
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* Author: Martin Lowe <martin.lowe@eclipse-foundation.org>
+*
+* SPDX-License-Identifier: EPL-2.0
+**********************************************************************/
 package org.eclipsefoundation.mailing.api;
 
 import javax.ws.rs.GET;