Bumping VERSION to 2.5.0-dev

Change-Id: I9ef05c6f5c2e9fd6f14704150b8466f824f61c86
diff --git a/VERSION b/VERSION
index 197c4d5..69fa968 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.0
+2.5.0-dev