Fixed broken link in README.md (#171)

Author: pgebert

README.md

@@ -14,7 +14,7 @@ New images are built and pushed to on a weekly basis (every Monday night).
 
 Check out the [docs](https://hub.docker.com/_/nginx) for the upstream Docker NGINX image for a detailed explanation on how to use this image.
 
-**Note:** Issues related to security vulnerabilities will be promptly closed unless they are accompanied by a solid reasoning as to why the vulnerability poses a real security threat to this image. Check out the [`SECURITY`](https://github.com/nginxinc/docker-nginx-unprivileged/blob/main/.github/SECURITY.md) doc for more details.
+**Note:** Issues related to security vulnerabilities will be promptly closed unless they are accompanied by a solid reasoning as to why the vulnerability poses a real security threat to this image. Check out the [`SECURITY`](https://github.com/nginxinc/docker-nginx-unprivileged/blob/main/SECURITY.md) doc for more details.
 
 ## Supported Image Registries and Platforms