Return voltha-lib-go to dev version

Change-Id: Id301865b9353472e23422b92ce69d8e13abde1c4
diff --git a/VERSION b/VERSION
index 0b6e431..ebbf6e5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.11
+2.2.12-dev