trappy: update copyright to 2016
diff --git a/tests/test_plot_utils.py b/tests/test_plot_utils.py
index ac8a6c9..d5a6def 100644
--- a/tests/test_plot_utils.py
+++ b/tests/test_plot_utils.py
@@ -1,4 +1,4 @@
-#    Copyright 2015-2015 ARM Limited
+#    Copyright 2015-2016 ARM Limited
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.