Upgraded module to support Terraform 0.12

main.tf

@@ -1,5 +1,5 @@
 resource "null_resource" "foo" {
   triggers = {
-    example = "${var.example}"
+    example = var.example
   }
 }

outputs.tf

@@ -1,9 +1,9 @@
 output "null_resource_id" {
-  value       = "${null_resource.foo.id}"
+  value       = null_resource.foo.id
   description = "An arbitrary value that changes each time the resource is replaced."
 }
 
 output "example_value" {
-  value       = "${var.example}"
+  value       = var.example
   description = "Example variable."
 }

variables.tf

@@ -1,5 +1,5 @@
 variable "example" {
   default     = "default value"
-  type        = "string"
+  type        = string
   description = "Example variable."
 }

versions.tf

@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 0.12"
+}