Updated for TF v0.13

Author: igorkotof

versions.tf

@@ -1,3 +1,8 @@
 terraform {
-  required_version = "~> 0.12.0"
+  required_providers {
+    aws = {
+      source = "hashicorp/aws"
+    }
+  }
+  required_version = ">= 0.12"
 }