Update SECURITY.md

Author: drakkan

SECURITY.md

@@ -7,7 +7,7 @@ We also welcome vulnerability reports for the development version to help us ens
 
 ## Reporting a Vulnerability
 
-If you believe you’ve found a security vulnerability in this project, we strongly encourage you to report it privately using GitHub’s [security advisory system]((https://github.com/pkg/sftp/security/advisories/new).
+If you believe you’ve found a security vulnerability in this project, we strongly encourage you to report it privately using GitHub’s [security advisory system](https://github.com/pkg/sftp/security/advisories/new).
 This will allow us to review and address the issue before public disclosure.  
 
 Thank you for helping us keep the project secure.