chore: update readme

README.md

@@ -85,6 +85,7 @@ See the [functions](https://github.com/terraform-aws-modules/terraform-aws-notif
 | [aws_cloudwatch_log_group.lambda](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_log_group) | resource |
 | [aws_iam_role.sns_feedback_role](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_role) | resource |
 | [aws_sns_topic.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic) | resource |
+| [aws_sns_topic_policy.access_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic_policy) | resource |
 | [aws_sns_topic_subscription.sns_notify_slack](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic_subscription) | resource |
 | [aws_caller_identity.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/caller_identity) | data source |
 | [aws_iam_policy_document.lambda](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
@@ -130,6 +131,7 @@ See the [functions](https://github.com/terraform-aws-modules/terraform-aws-notif
 | <a name="input_slack_emoji"></a> [slack\_emoji](#input\_slack\_emoji) | A custom emoji that will appear on Slack messages | `string` | `":aws:"` | no |
 | <a name="input_slack_username"></a> [slack\_username](#input\_slack\_username) | The username that will appear on Slack messages | `string` | n/a | yes |
 | <a name="input_slack_webhook_url"></a> [slack\_webhook\_url](#input\_slack\_webhook\_url) | The URL of Slack webhook | `string` | n/a | yes |
+| <a name="input_sns_topic_access_policy"></a> [sns\_topic\_access\_policy](#input\_sns\_topic\_access\_policy) | The JSON of the SNS topic policy, if any | `string` | `""` | no |
 | <a name="input_sns_topic_feedback_role_description"></a> [sns\_topic\_feedback\_role\_description](#input\_sns\_topic\_feedback\_role\_description) | Description of IAM role to use for SNS topic delivery status logging | `string` | `null` | no |
 | <a name="input_sns_topic_feedback_role_force_detach_policies"></a> [sns\_topic\_feedback\_role\_force\_detach\_policies](#input\_sns\_topic\_feedback\_role\_force\_detach\_policies) | Specifies to force detaching any policies the IAM role has before destroying it. | `bool` | `true` | no |
 | <a name="input_sns_topic_feedback_role_name"></a> [sns\_topic\_feedback\_role\_name](#input\_sns\_topic\_feedback\_role\_name) | Name of the IAM role to use for SNS topic delivery status logging | `string` | `null` | no |