Post release: bump version string for development

Change-Id: I94e59416461390fd8316a59f3b64a6ed9d38af6c
diff --git a/VERSION b/VERSION
index eab246c..534d9b5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-7.3.2
+7.3.3-dev