fix: Updated version requirements to be Terraform 0.13 only (#101)

Author: antonbabenko

README.md

@@ -74,7 +74,7 @@ To run the tests:
 
 | Name | Version |
 |------|---------|
-| terraform | >= 0.12.6, < 0.14 |
+| terraform | >= 0.13.0, < 0.14 |
 | aws | >= 2.35, < 4.0 |
 
 ## Providers

versions.tf

@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">= 0.12.6, < 0.14"
+  required_version = ">= 0.13.0, < 0.14"
 
   required_providers {
     aws = ">= 2.35, < 4.0"