Update copyright year to 2018.

llvm-svn: 334936
GitOrigin-RevId: 7555c589af006c9c4d171794200753d0e92ef946
diff --git a/acxxel/LICENSE.TXT b/acxxel/LICENSE.TXT
index b452ca2..547f6a4 100644
--- a/acxxel/LICENSE.TXT
+++ b/acxxel/LICENSE.TXT
@@ -4,7 +4,7 @@
 University of Illinois/NCSA
 Open Source License
 
-Copyright (c) 2007-2016 University of Illinois at Urbana-Champaign.
+Copyright (c) 2007-2018 University of Illinois at Urbana-Champaign.
 All rights reserved.
 
 Developed by: