This fixes the below error on installing the chart:
```
Error: UPGRADE FAILED: error validating "": error validating data: [ValidationError(MutatingWebhookConfiguration.webhooks[0]): missing required field "admissionReviewVersions" in io.k8s.api.admissionregistration.v1.MutatingWebhook, ValidationError(MutatingWebhookConfiguration.webhooks[1]): missing required field "admissionReviewVersions" in io.k8s.api.admissionregistration.v1.MutatingWebhook, ValidationError(MutatingWebhookConfiguration.webhooks[2]): missing required field "admissionReviewVersions" in io.k8s.api.admissionregistration.v1.MutatingWebhook, ValidationError(MutatingWebhookConfiguration.webhooks[3]): missing required field "admissionReviewVersions" in io.k8s.api.admissionregistration.v1.MutatingWebhook]
```
Ref #144
34d9c6d4db