Copyright.txt: Update year range to end in 2017
diff --git a/Copyright.txt b/Copyright.txt
index 63d7bb8..aa91102 100644
--- a/Copyright.txt
+++ b/Copyright.txt
@@ -1,5 +1,5 @@
 CMake - Cross Platform Makefile Generator
-Copyright 2000-2016 Kitware, Inc. and Contributors
+Copyright 2000-2017 Kitware, Inc. and Contributors
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without