Update README.md to be consistent with AzureRM 4.0 release guidance (#…

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* Update README.md

* Update README.md

README.md

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 The AzureRM Terraform Provider allows managing resources within Azure Resource Manager.
 
-When using version 3.0 of the AzureRM Provider we recommend using Terraform 1.x ([the latest version can be found here](https://www.terraform.io/downloads)). Whilst older versions of Terraform Core (0.12.x and later) remain compatible with v3.0 of the AzureRM Provider - support for versions prior to 1.0 will be removed in the next major release of the AzureRM Provider (v4.0).
+When using version 4.0 of the AzureRM Provider we recommend using the latest version of Terraform Core ([the latest version can be found here](https://developer.hashicorp.com/terraform/install)). 
 
 * [Terraform Website](https://www.terraform.io)
 * [AzureRM Provider Documentation](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs)