docs(changelog): changelog for lts-v2.10.15 release

Change-Id: I389e594db6ea28cde73f1d808aa21b215b5ca541
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/readme.rst b/readme.rst
index 4fc3321..899d4c0 100644
--- a/readme.rst
+++ b/readme.rst
@@ -60,3 +60,4 @@
 
 
 
+