Bump minor version post VOLTHA2.4 branch out

Change-Id: I44c937820f059b6a1dff63c14f529c153d9cd18c
diff --git a/VERSION b/VERSION
index 79a6144..69fa968 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.4
+2.5.0-dev