docs(changelog): changelog for lts-v2.12.2 release

Change-Id: I57ffc9670a87240ba22109971cbdb04700ca0bd4
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/readme.rst b/readme.rst
index ab4c887..6432246 100644
--- a/readme.rst
+++ b/readme.rst
@@ -50,3 +50,4 @@
 .. _trustedfirmware.org: http://www.trustedfirmware.org
 
 
+