refactor aws provider to retrieve from parent module (#3)

* moves provider block into root module, rather than child

* remove provider from WAF resource, as inherited from parent module

* re-add providers reference now it is passed to child module

* add required providers

* add required providers

* add required providers

main.tf

@@ -8,7 +8,11 @@ locals {
   }
 }
 
-provider "aws" {
-  region = "us-east-1"
-  alias  = "us-east-1"
+terraform {
+  required_providers {
+    aws = {
+      source = "hashicorp/aws"
+      configuration_aliases = [ aws.us-east-1 ]
+    }
+  }
 }