Update copyright year to 2018.

llvm-svn: 334936
GitOrigin-RevId: 7555c589af006c9c4d171794200753d0e92ef946
diff --git a/LICENSE.TXT b/LICENSE.TXT
index a17dc12..0134694 100644
--- a/LICENSE.TXT
+++ b/LICENSE.TXT
@@ -14,7 +14,7 @@
 University of Illinois/NCSA
 Open Source License
 
-Copyright (c) 2009-2016 by the contributors listed in CREDITS.TXT
+Copyright (c) 2009-2018 by the contributors listed in CREDITS.TXT
 
 All rights reserved.