Make the file UTF-8 again

GitHub web interface failed to show the encoding change.
diff --git a/src/hb-subset-input.hh b/src/hb-subset-input.hh
index 982e69a..07c0e22 100644
--- a/src/hb-subset-input.hh
+++ b/src/hb-subset-input.hh
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2018  Google, Inc.
+ * Copyright © 2018  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *