docs(changelog): changelog for v2.9 release

Change-Id: Ic8cd82c5424af422feedefdc001d291001817a8b
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
diff --git a/package-lock.json b/package-lock.json
index a3e0ff9..89ebd51 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "trusted-firmware-a",
-  "version": "2.8.0",
+  "version": "2.9.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "trusted-firmware-a",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "hasInstallScript": true,
       "license": "BSD-3-Clause",
       "devDependencies": {