COSE: Fix typo in license header

Change-Id: Ic05e1d7b07522984a2d780d823c3a06ab979c6b3
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
diff --git a/lib/t_cose/inc/t_cose_common.h b/lib/t_cose/inc/t_cose_common.h
index 1459702..6e585d4 100644
--- a/lib/t_cose/inc/t_cose_common.h
+++ b/lib/t_cose/inc/t_cose_common.h
@@ -5,7 +5,7 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
- * See BSD-3-Clause license in README.mdE.
+ * See BSD-3-Clause license in README.md.
  */