Merge pull request #55 from terraform-google-modules/internal/0.12-update-README

Add a note about 0.11.x compatible version to README

Author: aaron-lane

README.md

@@ -8,6 +8,10 @@ It supports creating:
 - Subnets within the VPC
 - Secondary ranges for the subnets (if applicable)
 
+## Compatibility
+
+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 [0.8.0](https://registry.terraform.io/modules/terraform-google-modules/network/google/0.8.0).
+
 ## Usage
 You can go to the examples folder, however the usage of the module could be like this in your own main.tf file: