Add support for terraform outputs?

Hi!

Love this tool! I've been piping json plans to jq to pick apart plans, but I'll just start using this as it pretty much fits my needs.

I was wondering if there are plans to add terraform outputs to the summary? If not, that's okay.

resource "aws_iam_user" "test" {
  name = "test"
}

resource "aws_iam_user" "test2" {
  name = "test2"
}

output "user1-name" {
  value = aws_iam_user.test.name
}
output "user2-name" {
  value = aws_iam_user.test2.name
}

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # aws_iam_user.test will be created
  + resource "aws_iam_user" "test" {
      + arn           = (known after apply)
      + force_destroy = false
      + id            = (known after apply)
      + name          = "test"
      + path          = "/"
      + tags_all      = (known after apply)
      + unique_id     = (known after apply)
    }

  # aws_iam_user.test2 will be created
  + resource "aws_iam_user" "test2" {
      + arn           = (known after apply)
      + force_destroy = false
      + id            = (known after apply)
      + name          = "test2"
      + path          = "/"
      + tags_all      = (known after apply)
      + unique_id     = (known after apply)
    }

Plan: 2 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  + user1-name = "test"
  + user2-name = "test2"

terraform show -json out.tfplan | tf-summarize                
+--------+--------------------+
| CHANGE |        NAME        |
+--------+--------------------+
| add    | aws_iam_user.test  |
+        +--------------------+
|        | aws_iam_user.test2 |
+--------+--------------------+

dineshba / tf-summarize

Add support for terraform outputs? #31