fixed copyright

diff --git a/bundles/runtime/org.eclipse.fx.core/src/org/eclipse/fx/core/observable/StringValueObservable.java b/bundles/runtime/org.eclipse.fx.core/src/org/eclipse/fx/core/observable/StringValueObservable.java
index bcab0b0..7a5ef6d 100644
--- a/bundles/runtime/org.eclipse.fx.core/src/org/eclipse/fx/core/observable/StringValueObservable.java
+++ b/bundles/runtime/org.eclipse.fx.core/src/org/eclipse/fx/core/observable/StringValueObservable.java

@@ -1,3 +1,13 @@
+/*******************************************************************************
+ * Copyright (c) 2017 BestSolution.at and others.
+ * 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
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
+ *******************************************************************************/
 package org.eclipse.fx.core.observable;
 
 class StringValueObservable extends BaseValueObservable<String> implements ValueObservable.OString {