Update supported provider version in README

Author: aaron-lane

README.md

@@ -194,7 +194,7 @@ The [project factory](https://github.com/terraform-google-modules/terraform-goog
 - [kubectl](https://github.com/kubernetes/kubernetes/releases) 1.9.x
 #### Terraform and Plugins
 - [Terraform](https://www.terraform.io/downloads.html) 0.11.x
-- [terraform-provider-google](https://github.com/terraform-providers/terraform-provider-google) v2.0.0
+- [terraform-provider-google](https://github.com/terraform-providers/terraform-provider-google) v2.3
 
 ### Configure a Service Account
 In order to execute this module you must have a Service Account with the

autogen/README.md

@@ -138,9 +138,9 @@ The [project factory](https://github.com/terraform-google-modules/terraform-goog
 #### Terraform and Plugins
 - [Terraform](https://www.terraform.io/downloads.html) 0.11.x
 {% if private_cluster %}
-- [terraform-provider-google-beta](https://github.com/terraform-providers/terraform-provider-google-beta) v2.0.0
+- [terraform-provider-google-beta](https://github.com/terraform-providers/terraform-provider-google-beta) v2.3
 {% else %}
-- [terraform-provider-google](https://github.com/terraform-providers/terraform-provider-google) v2.0.0
+- [terraform-provider-google](https://github.com/terraform-providers/terraform-provider-google) v2.3
 {% endif %}
 
 ### Configure a Service Account

modules/private-cluster/README.md

@@ -202,7 +202,7 @@ The [project factory](https://github.com/terraform-google-modules/terraform-goog
 - [kubectl](https://github.com/kubernetes/kubernetes/releases) 1.9.x
 #### Terraform and Plugins
 - [Terraform](https://www.terraform.io/downloads.html) 0.11.x
-- [terraform-provider-google-beta](https://github.com/terraform-providers/terraform-provider-google-beta) v2.0.0
+- [terraform-provider-google-beta](https://github.com/terraform-providers/terraform-provider-google-beta) v2.3
 
 ### Configure a Service Account
 In order to execute this module you must have a Service Account with the