Merge pull request #14 from terraform-google-modules/aaron-lane-patch-1

Add link to 0.12 upgrade guide in README

README.md

@@ -3,7 +3,8 @@
 This Terraform module makes it easier to manage to manage [organization policies](https://cloud.google.com/resource-manager/docs/organization-policy/overview) for your Google Cloud environment, particularly when you want to have exclusion rules. This module will allow you to set a top-level org policy and then disable it on individual projects or folders easily.
 
 ## Compatibility
-This module is meant for use with Terraform 0.12. If you haven't [upgraded][terraform-0.12-upgrade] and need a Terraform 0.11.x-compatible version of this module, the last released version intended for Terraform 0.11.x
+This module is meant for use with Terraform 0.12. If you haven't [upgraded](https://www.terraform.io/upgrade-guides/0-12.html) and
+need a Terraform 0.11.x-compatible version of this module, the last released version intended for Terraform 0.11.x
 is [1.0.0](https://github.com/terraform-google-modules/terraform-google-org-policy/releases/tag/v1.0.0).
 
 ## Usage