triggering the release of the new voltha chart for 2.5

Change-Id: I8fe922863897b5540eb6ad89b476c5e9ef8d6062
diff --git a/VERSION b/VERSION
index 73462a5..499bd1e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5.1
+2.5.2-dev