Add updateStrategy to README

Author: kirrmann

helm/aws-load-balancer-controller/README.md

@@ -194,3 +194,4 @@ The default values set by the application itself can be confirmed [here](https:/
 | `defaultTags`                               | Default tags to apply to all AWS resources managed by this controller                                    | `{}`                                                                               |
 | `replicaCount`                              | Number of controller pods to run, only one will be active due to leader election                         | `2`                                                                                |
 | `podDisruptionBudget`                       | Limit the disruption for controller pods. Require at least 2 controller replicas and 3 worker nodes      | `{}`                                                                               |
+| `udpateStrategy`                            | Defines the update strategy for the deployment                                                           | `{}`                                                                               |