fix: Fix broken link in README.md (terraform-google-modules#691)

Author: nateinaction

README.md

@@ -18,7 +18,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

autogen/main/README.md

@@ -48,7 +48,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

modules/beta-private-cluster-update-variant/README.md

@@ -43,7 +43,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

modules/beta-private-cluster/README.md

@@ -21,7 +21,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

modules/beta-public-cluster-update-variant/README.md

@@ -40,7 +40,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

modules/beta-public-cluster/README.md

@@ -18,7 +18,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

modules/private-cluster-update-variant/README.md

@@ -43,7 +43,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {

modules/private-cluster/README.md

@@ -21,7 +21,7 @@ This module is meant for use with Terraform 0.12. If you haven't
 intended for Terraform 0.11.x is [3.0.0].
 
 ## Usage
-There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/examples/) folder but simple usage is as follows:
+There are multiple examples included in the [examples](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples) folder but simple usage is as follows:
 
 ```hcl
 module "gke" {