added missing copyright header

Author: martinlippert

eclipse-language-servers/org.springframework.tooling.ls.eclipse.commons/src/org/springframework/tooling/ls/eclipse/commons/commands/JavaWorkspaceCommandHanlder.java

@@ -1,3 +1,13 @@
+/*******************************************************************************
+ * Copyright (c) 2018, 2020 Pivotal, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
 package org.springframework.tooling.ls.eclipse.commons.commands;
 
 import java.util.List;