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: I31bf1d3c55051aa0417323b942beb4cab785595e
diff --git a/VERSION b/VERSION
index bd8293a..b3631ba 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-7.4.6
+7.4.8-dev