chore: update README.md

Author: actions-user

README.md

@@ -218,6 +218,7 @@ module "rds_instance" {
 | <a name="input_availability_zone"></a> [availability\_zone](#input\_availability\_zone) | The AZ for the RDS instance. Specify one of `subnet_ids`, `db_subnet_group_name` or `availability_zone`. If `availability_zone` is provided, the instance will be placed into the default VPC or EC2 Classic | `string` | `null` | no |
 | <a name="input_backup_retention_period"></a> [backup\_retention\_period](#input\_backup\_retention\_period) | Backup retention period in days. Must be > 0 to enable backups | `number` | `0` | no |
 | <a name="input_backup_window"></a> [backup\_window](#input\_backup\_window) | When AWS can perform DB snapshots, can't overlap with maintenance window | `string` | `"22:00-03:00"` | no |
+| <a name="input_blue_green_update_enabled"></a> [blue\_green\_update\_enabled](#input\_blue\_green\_update\_enabled) | Enables low-downtime updates using RDS Blue/Green deployments. Low-downtime updates are only available for DB Instances using MySQL, MariaDB and PostgreSQL, as other engines are not supported by RDS Blue/Green deployments. They cannot be used with DB Instances with replicas. | `bool` | `false` | no |
 | <a name="input_ca_cert_identifier"></a> [ca\_cert\_identifier](#input\_ca\_cert\_identifier) | The identifier of the CA certificate for the DB instance | `string` | `null` | no |
 | <a name="input_charset_name"></a> [charset\_name](#input\_charset\_name) | The character set name to use for DB encoding. [Oracle & Microsoft SQL only](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/db_instance#character_set_name). For other engines use `db_parameter` | `string` | `null` | no |
 | <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br/>See description of individual variables for details.<br/>Leave string and numeric variables as `null` to use default value.<br/>Individual variable settings (non-null) override settings in context object,<br/>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br/>  "additional_tag_map": {},<br/>  "attributes": [],<br/>  "delimiter": null,<br/>  "descriptor_formats": {},<br/>  "enabled": true,<br/>  "environment": null,<br/>  "id_length_limit": null,<br/>  "label_key_case": null,<br/>  "label_order": [],<br/>  "label_value_case": null,<br/>  "labels_as_tags": [<br/>    "unset"<br/>  ],<br/>  "name": null,<br/>  "namespace": null,<br/>  "regex_replace_chars": null,<br/>  "stage": null,<br/>  "tags": {},<br/>  "tenant": null<br/>}</pre> | no |