VOL-2630 Release voltha-openolt-adapter 2.3.6

Change-Id: I42c4f9926ede7dd8e52fc7dff5c260c06db83ca1
diff --git a/VERSION b/VERSION
index a2a044c..e75da3e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.6-dev
+2.3.6