docs(readme): update terraform documentation

Author: steveteuber

Diff for: README.md

@@ -82,7 +82,7 @@ Here is a working example of using this Terraform module:
 
 | Name | Source | Version |
 |------|--------|---------|
-| <a name="module_acm"></a> [acm](#module\_acm) | terraform-aws-modules/acm/aws | ~> 4.3.1 |
+| <a name="module_acm"></a> [acm](#module\_acm) | terraform-aws-modules/acm/aws | ~> 5.0.0 |
 
 ## Resources