Update README.md

README.md

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+[![Static security analysis for Terraform](https://github.com/avidhara/terraform-google-network/actions/workflows/checkov.yml/badge.svg)](https://github.com/avidhara/terraform-google-network/actions/workflows/checkov.yml)
 # Terraform module for Google Cloud Network
 
 ## Usage
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 | <a name="output_router_id"></a> [router\_id](#output\_router\_id) | an identifier for the resource with format projects/{{project}}/regions/{{region}}/routers/{{name}} |
 | <a name="output_self_link"></a> [self\_link](#output\_self\_link) | The URI of the created resource. |
 | <a name="output_subnet_ids"></a> [subnet\_ids](#output\_subnet\_ids) | n/a |
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