Update README.rst

remove unrelated iptables readme.
diff --git a/README.rst b/README.rst
index 030ccb7..9b86071 100644
--- a/README.rst
+++ b/README.rst
@@ -198,28 +198,6 @@
         apiserver:
           secure_port: 8081
 
-Other k8s services which communicates with secure api still communicate with 443 port. You can you proxy or iptables formula.
-
-.. code-block:: yaml
-
-    iptables:
-      _support:
-        sensu:
-          enabled: false
-        sphinx:
-          enabled: false
-      service:
-        enabled: true
-        chain:
-          PREROUTING:
-            rules:
-              - table: nat
-                chain: PREROUTING
-                destination_port: 443
-                jump: REDIRECT
-                to_port: 8081
-                protocol: tcp
-
 Kubernetes with Flannel
 -----------------------