chore(readme): add Snyk badge

Author: sheerlox

README.md

@@ -4,6 +4,7 @@
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/insurgent-lab/commitlint-config/release.yml?branch=main)](https://github.com/insurgent-lab/commitlint-config/actions/workflows/release.yml)
 [![Codecov](https://codecov.io/gh/insurgent-lab/commitlint-config/branch/main/graph/badge.svg)](https://codecov.io/gh/insurgent-lab/commitlint-config)
 [![Renovate](https://img.shields.io/badge/renovate-enabled-brightgreen.svg)](https://github.com/insurgent-lab/commitlint-config/issues/3)
+![Snyk](https://img.shields.io/snyk/vulnerabilities/github/insurgent-lab/commitlint-config)
 
 Shareable [`commitlint`](https://github.com/conventional-changelog/commitlint) config enforcing [conventional commits](https://conventionalcommits.org/) with rules from [@insurgentlab/conventional-changelog-preset](https://github.com/insurgent-lab/conventional-changelog-preset).
 Use with [@commitlint/cli](https://www.npmjs.com/package/@commitlint/cli) and [@commitlint/prompt-cli](https://www.npmjs.com/package/@commitlint/prompt-cli).