VOL-5132 - Create beta-release branch for voltha-lib-go

VERSION
-------
  o Bump version string and suffix *-dev to avoid future conflicts with master branch.

Change-Id: Ifbd5e60b5fcd5a69e5e4634c231eb7031a7d592c
diff --git a/VERSION b/VERSION
index 59feb42..11da16c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.12.5.3-dev
+2.12.5.4-dev