Update copyright dates.
diff --git a/COPYING b/COPYING
index e308632..98458d9 100644
--- a/COPYING
+++ b/COPYING
@@ -1,10 +1,10 @@
Unless otherwise specified, files in the jemalloc source distribution are
subject to the following license:
--------------------------------------------------------------------------------
-Copyright (C) 2002-2017 Jason Evans <jasone@canonware.com>.
+Copyright (C) 2002-2018 Jason Evans <jasone@canonware.com>.
All rights reserved.
Copyright (C) 2007-2012 Mozilla Foundation. All rights reserved.
-Copyright (C) 2009-2017 Facebook, Inc. All rights reserved.
+Copyright (C) 2009-2018 Facebook, Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
