Starting 4.3.0 release

Change-Id: Iccc3db6ca266568181660280ee93066b658f0a6e
diff --git a/VERSION b/VERSION
index 6aba2b2..50299d1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.2.0
+4.3.0-dev