Releasing BBSim 1.6.1

Change-Id: Icceea710e2326e0a4f1d5ef75a5825f10f5a74d9
diff --git a/VERSION b/VERSION
index 06bb452..9c6d629 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.6.1-dev
+1.6.1