Update copyright years.
diff --git a/lib/zip_source_open.c b/lib/zip_source_open.c
index e4cb0b3..ec01b0d 100644
--- a/lib/zip_source_open.c
+++ b/lib/zip_source_open.c
@@ -1,6 +1,6 @@
 /*
   zip_source_open.c -- open zip_source (prepare for reading)
-  Copyright (C) 2009-2016 Dieter Baron and Thomas Klausner
+  Copyright (C) 2009-2017 Dieter Baron and Thomas Klausner
 
   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>