Add missing copyright headers

Author: iText-CI

kernel/src/test/java/com/itextpdf/kernel/pdf/copy/PdfAnnotationCopyingTest.java

@@ -1,6 +1,6 @@
 /*
     This file is part of the iText (R) project.
-    Copyright (c) 1998-2019 iText Group NV
+    Copyright (c) 1998-2020 iText Group NV
     Authors: iText Software.
 
     This program is offered under a commercial and under the AGPL license.