docs(changelog): changelog for lts-v2.8.17 release

Change-Id: Icd99a374909938d992c19f21884b8450aa5c7423
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/readme.rst b/readme.rst
index 148d477..c68ccc7 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
 
+