[VOL-2377] - Bump openolt agent version to 2.0.0 for VOLTHA-2.2 release.

Change-Id: I5a0e8edbc023409ec6f1664ad2186c0760ea831b
diff --git a/VERSION b/VERSION
index d72f262..227cea2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.0-dev
+2.0.0