VOL-3303: Bump BBSIM version for 2.4 release

Change-Id: I8f44bdf0488cbbaaf289d850fbebb612dc01c15b
diff --git a/VERSION b/VERSION
index aebc71f..53a75d6 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.2.6-dev
+0.2.6