validate for terraform 0.13 (#244)

* updated default kubernetes version to v1.18.10, fixed deprecated interpolation-only expressions

* validated for terraform 0.13

Author: hyder

main.tf

@@ -1,13 +1,9 @@
 # Copyright 2017, 2019, Oracle Corporation and/or affiliates.  All rights reserved.
 # Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl
 
-terraform {
-  required_version = ">= 0.12.24"
-}
-
 module "base" {
   source  = "oracle-terraform-modules/base/oci"
-  version = "1.3.3"
+  version = "2.0.0-RC1"
 
   # general oci parameters
   oci_base_general = local.oci_base_general

versions.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    oci = {
+      source = "hashicorp/oci"
+    }
+  }
+  required_version = ">= 0.13"
+}