Update AWS provider to version 4 (#23)

Author: jnonino

README.md

@@ -35,7 +35,7 @@ In order to run all checks at any point run the following command:
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 3.74 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 4 |
 
 ## Providers
 

examples/test/mock_provider.tf

@@ -3,7 +3,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 3.74"
+      version = ">= 4"
     }
   }
 }

versions.tf

@@ -3,7 +3,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 3.74"
+      version = ">= 4"
     }
   }
 }