Start version 1.2.7-dev

Change-Id: Id5a304d2d36caafa8f84708ffaaf0b2d5f724cb2
diff --git a/VERSION b/VERSION
index 3c43790..424d5b0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.6
+1.2.7-dev