Add support for the "No Upstream" config option

Change-Id: Id684ea89363f341abc6a6adf5db6748633a1b456
Closes-Bug: PROD-20662
diff --git a/README.rst b/README.rst
index 598e985..e1207b5 100644
--- a/README.rst
+++ b/README.rst
@@ -23,6 +23,9 @@
         connect_ports:
           - 443
         upstream: 10.11.236.1:8080
+        noupstream:
+          - domain.to.be.excluded.from.proxying
+          - 127.0.0.0/24
 
 
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