Update year in copyright notice.
diff --git a/linenoise.c b/linenoise.c
index 29555b0..9d36bfc 100644
--- a/linenoise.c
+++ b/linenoise.c
@@ -10,8 +10,8 @@
*
* ------------------------------------------------------------------------
*
- * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ * Copyright (c) 2010-2013, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
*
* All rights reserved.
*