VOL-2189 update voltha-lib-go to use voltha-protos=v2.0.0;
Release 2.2.9

Change-Id: I4421bc86324c692e71494cb09ba1ddc5454c1054
diff --git a/VERSION b/VERSION
index bf16b9b..a6333e4 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.9-dev
+2.2.9