VOL-5135 - Create a beta branch for voltha-openolt-adapter

VERSION
-------
  o Bump version string with suffix *-dev for post release versioning.

Change-Id: I166b8920a724110fd7bd9f3403c20e3ec1a17cac
diff --git a/VERSION b/VERSION
index ca27416..7075368 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.3.9-dev
+4.4.0-dev