fix: Argument update_default_version type should be a bool (#272)

* Change  variable type from string to bool.

* Update README for  type.

Author: cedarkuo

README.md

@@ -350,7 +350,7 @@ No modules.
 | <a name="input_termination_policies"></a> [termination\_policies](#input\_termination\_policies) | A list of policies to decide how the instances in the Auto Scaling Group should be terminated. The allowed values are `OldestInstance`, `NewestInstance`, `OldestLaunchConfiguration`, `ClosestToNextInstanceHour`, `OldestLaunchTemplate`, `AllocationStrategy`, `Default` | `list(string)` | `[]` | no |
 | <a name="input_traffic_source_identifier"></a> [traffic\_source\_identifier](#input\_traffic\_source\_identifier) | Identifies the traffic source. For Application Load Balancers, Gateway Load Balancers, Network Load Balancers, and VPC Lattice, this will be the Amazon Resource Name (ARN) for a target group in this account and Region. For Classic Load Balancers, this will be the name of the Classic Load Balancer in this account and Region | `string` | `""` | no |
 | <a name="input_traffic_source_type"></a> [traffic\_source\_type](#input\_traffic\_source\_type) | Provides additional context for the value of identifier. The following lists the valid values: `elb` if `identifier` is the name of a Classic Load Balancer. `elbv2` if `identifier` is the ARN of an Application Load Balancer, Gateway Load Balancer, or Network Load Balancer target group. `vpc-lattice` if `identifier` is the ARN of a VPC Lattice target group | `string` | `"elbv2"` | no |
-| <a name="input_update_default_version"></a> [update\_default\_version](#input\_update\_default\_version) | Whether to update Default Version each update. Conflicts with `default_version` | `string` | `null` | no |
+| <a name="input_update_default_version"></a> [update\_default\_version](#input\_update\_default\_version) | Whether to update Default Version each update. Conflicts with `default_version` | `bool` | `null` | no |
 | <a name="input_use_mixed_instances_policy"></a> [use\_mixed\_instances\_policy](#input\_use\_mixed\_instances\_policy) | Determines whether to use a mixed instances policy in the autoscaling group or not | `bool` | `false` | no |
 | <a name="input_use_name_prefix"></a> [use\_name\_prefix](#input\_use\_name\_prefix) | Determines whether to use `name` as is or create a unique name beginning with the `name` as the prefix | `bool` | `true` | no |
 | <a name="input_user_data"></a> [user\_data](#input\_user\_data) | The Base64-encoded user data to provide when launching the instance | `string` | `null` | no |

variables.tf

@@ -344,7 +344,7 @@ variable "default_version" {
 
 variable "update_default_version" {
   description = "Whether to update Default Version each update. Conflicts with `default_version`"
-  type        = string
+  type        = bool
   default     = null
 }