return to -dev version

Change-Id: I5b62e5effcbcf98c351400fc1ef8ff02b7417532
diff --git a/VERSION b/VERSION
index 530cdd9..7c8d436 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.4
+2.2.5-dev