docs(changelog): changelog for lts-v2.12.1 release

Change-Id: Id73c4039740d206e7c0dc386b2b7d5d3cd73f9d3
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/readme.rst b/readme.rst
index 171b32b..ab4c887 100644
--- a/readme.rst
+++ b/readme.rst
@@ -49,3 +49,4 @@
 .. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a
 .. _trustedfirmware.org: http://www.trustedfirmware.org
 
+