Bumping version to 2.10.0-dev

Change-Id: I91e019effbd312c0a2ae23342d8cc7a713d3ec34
diff --git a/VERSION b/VERSION
index c8e38b6..14377a8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.9.0
+2.10.0-dev