Update Copyright headers

test/test-cplusplus.cc

diff --git a/test/test-cplusplus.cc b/test/test-cplusplus.cc
index 3488b78..55a4d18 100644
--- a/test/test-cplusplus.cc
+++ b/test/test-cplusplus.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010  Google, Inc.
+ * Copyright © 2011  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *