Add copyright notice of Rene Scharfe to tar-tree.c
diff --git a/tar-tree.c b/tar-tree.c
index 8b0d75b..d313c80 100644
--- a/tar-tree.c
+++ b/tar-tree.c
@@ -1,3 +1,6 @@
+/*
+ * Copyright (c) 2005 Rene Scharfe
+ */
 #include <time.h>
 #include "cache.h"