Update README.md

Author: pierluigilenoci

helm/oauth2-proxy/README.md

@@ -188,6 +188,8 @@ The following table lists the configurable parameters of the oauth2-proxy chart
 | `revisionHistoryLimit`                                | maximum number of revisions maintained                                                                                                                                                                                                                           | 10                                                                               |
 | `service.portNumber`                                  | port number for the service                                                                                                                                                                                                                                      | `80`                                                                             |
 | `service.appProtocol`                                 | application protocol on the port of the service                                                                                                                                                                                                                  | `http`                                                                           |
+| `service.externalTrafficPolicy`                       | denotes if the service desires to route external traffic to node-local or cluster-wide endpoints                                                                                                                                                                 | `Cluster`                                                                        |
+| `service.internalTrafficPolicy`                       | denotes if the service desires to route internal traffic to node-local or cluster-wide endpoints                                                                                                                                                                 | `Cluster`                                                                        |
 | `service.type`                                        | type of service                                                                                                                                                                                                                                                  | `ClusterIP`                                                                      |
 | `service.clusterIP`                                   | cluster ip address                                                                                                                                                                                                                                               | `nil`                                                                            |
 | `service.loadBalancerIP`                              | ip of load balancer                                                                                                                                                                                                                                              | `nil`                                                                            |