Updating to Terraform 0.13

Author: jnonino

versions.tf

@@ -1,4 +1,9 @@
 
 terraform {
-  required_version = ">= 0.12"
+  required_version = ">= 0.13"
+  required_providers {
+    aws = {
+      source = "hashicorp/aws"
+    }
+  }
 }