[VOL-3634] Adding multi-stack support docs

Change-Id: I290ca9b2e9ee73c96010b53493144da728377f01
diff --git a/VERSION b/VERSION
index 437459c..8f87ff7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5.0
+2.6.0-dev