Updating released versions

Change-Id: Id8291e863dc96de8d805a70af15a6e4d50e71698
diff --git a/.gitreview b/.gitreview
index 94a12ba..1052b58 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=voltha-docs.git
 defaultremote=origin
+defaultbranch=voltha-2.8