Update README.md

Author: davidrissato

aws-redis-replication-group/README.md

@@ -20,19 +20,23 @@ a replication group with the given parameters.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| at\_rest\_encryption\_enabled | Whether to enable encryption at rest. | `bool` | `false` | no |
 | apply\_immediately | Whether changes should be applied immediately or during the next maintenance window. | `bool` | `true` | no |
 | availability\_zone | Availability zone in which this instance should run. | `string` | `null` | no |
 | engine\_version | The version of Redis to run. See [supported versions](https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/supported-engine-versions.html) | `string` | `"5.0.5"` | no |
 | env | Env for tagging and naming. See [doc](../README.md#consistent-tagging). | `string` | n/a | yes |
 | ingress\_security\_group\_ids | Source security groups which should be able to contact this instance. | `list(string)` | n/a | yes |
 | instance\_type | The type of instance to run. See [supported node types](https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/CacheNodes.SupportedTypes.html) | `string` | `"cache.m5.large"` | no |
+| number_cache_clusters | Number of cache clusters. | `number` | 1 | no |
 | owner | Owner for tagging and naming. See [doc](../README.md#consistent-tagging). | `string` | n/a | yes |
 | parameter\_group\_name | Parameter group to use for this Redis cache. | `string` | `"default.redis5.0"` | no |
 | port | Port to host Redis on. | `number` | `6379` | no |
 | project | Project for tagging and naming. See [doc](../README.md#consistent-tagging) | `string` | n/a | yes |
+| replication\_group\_description | A user-created description for the replication group. | `string` | n/a | yes |
 | resource\_name | If not set, name will be [var.project]-[var.env]-[var.name]. | `string` | `""` | no |
 | service | Service for tagging and naming. See [doc](../README.md#consistent-tagging) | `string` | `"redis"` | no |
 | subnets | List of subnets to which this EC instance should be attached. They should probably be private. | `list(string)` | n/a | yes |
+| transit\_encryption\_enabled | Whether to enable encryption in transit. | `bool` | `false` | no |
 | vpc\_id | VPC where the cache will be deployed. | `string` | n/a | yes |
 
 ## Outputs