Update git_refs for repos with linked docs

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I20e7c90e0c6e4a934d77a9358c208bdae6ca68c3
diff --git a/VERSION b/VERSION
index e8f6dcd..3db58c9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.8.18
+2.8.19