VOL-2137 move to next dev release

Change-Id: I69ad27a86816a8d5e95f15732fd414adfd9f0fda
diff --git a/VERSION b/VERSION
index 21bb5e1..f963933 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.5
+2.2.6-dev