Update Copyright headers

src/main.cc

diff --git a/src/main.cc b/src/main.cc
index 8126dae..4bf809e 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007,2008,2009  Red Hat, Inc.
+ * Copyright © 2007,2008,2009  Red Hat, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *