VOL-4964 - Update core contributors list

Last two pull requests including VERSION=2.12.0 did not initiate publishing
content to docs.voltha.org.  Create another pull request with release VERSION
string and modified content to see if that will trigger a release.

Change-Id: Ica3edca4ba2ca5bf7b8fc75eb4c1f688a671a456
diff --git a/VERSION b/VERSION
index d8b6989..3cf561c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.12.0
+2.12.1