chore: fix command to execute terraform-validator (#502)

* Fix command to execute terraform-validator

* Added how to add binary to PATH

* Update README

Author: vfigueiredo-cit

0-bootstrap/README.md

@@ -113,7 +113,7 @@ your current Jenkins manager (master) environment.
     ```
 1. Run `terraform init`.
 1. Run `terraform plan` and review the output.
-1. To run terraform-validator steps please follow the [instructions](https://github.com/forseti-security/policy-library/blob/master/docs/user_guide.md#install-terraform-validator) in the **Install Terraform Validator** section and install version `2021-03-22`. You will also need to rename the binary from `terraform-validator-<your-platform>` to `terraform-validator`.
+1. To run terraform-validator steps please follow the [instructions](https://github.com/forseti-security/policy-library/blob/master/docs/user_guide.md#install-terraform-validator) in the **Install Terraform Validator** section and install version `2021-03-22`. You will also need to rename the binary from `terraform-validator-<your-platform>` to `terraform-validator`and the terraform-validator binary must be in your PATH.
     1. Run `terraform plan -input=false -out bootstrap.tfplan`
     1. Run `terraform show -json bootstrap.tfplan > bootstrap.json`
     1. Run `terraform-validator validate bootstrap.json --policy-path="../policy-library" --project <A-VALID-PROJECT-ID>` and check for violations (`<A-VALID-PROJECT-ID>` must be an existing project you have access to, this is necessary because Terraform-validator needs to link resources to a valid Google Cloud Platform project).