changed updateStrategy default value in readme

Author: Barkha Choithani

README.md

@@ -516,7 +516,7 @@ This table describes the list of available parameters for Helm Chart.
 | `networkPolicy.customRules`      | Placeholder to specify selectors              | `{}`                               |
 | `networkPolicy.ports`      | Ports to which traffic is allowed              | `[8000, 8001, 8002]`                               |
 | `priorityClassName`      | Name of a PriortyClass defined to set pod priority        | `""`                               |
-| `updateStrategy`      | Update strategy for helm chart and app version updates        | `RollingUpdate`                               |
+| `updateStrategy`      | Update strategy for helm chart and app version updates        | `OnDelete`                               |
 
 # Known Issues and Limitations