Update ARM Ltd. copyright to 2017
diff --git a/trappy/devfreq_power.py b/trappy/devfreq_power.py
index 0b46c15..a8a0ac1 100644
--- a/trappy/devfreq_power.py
+++ b/trappy/devfreq_power.py
@@ -1,4 +1,4 @@
-#    Copyright 2015-2016 ARM Limited
+#    Copyright 2015-2017 ARM Limited
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.