BSDL in csl-1.5.0 vs BSDL in csl-1.5.1

- old
+ new
@@ -1,8 +1,8 @@
 CSL-Ruby. A Ruby CSL parser and library.
 
 Copyright 2012 President and Fellows of Harvard College.
-Copyright 2009-2014 Sylvester Keil. All rights reserved.
+Copyright 2009-2020 Sylvester Keil. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
  1. Redistributions of source code must retain the above copyright notice,