SECURITY: fix web site typo

docs/SECURITY.md

@@ -7,8 +7,8 @@ should be handled in the libssh2 project.
 Publishing Information
 ----------------------
 
-All known and public libssh2 vulnerabilities will be listed on [the libssh2 web
-site](https://libssh2.haxx.se/).
+All known and public libssh2 vulnerabilities will be listed on [the libssh2
+web site](https://www.libssh2.org/).
 
 Security vulnerabilities should not be entered in the project's public bug
 tracker unless the necessary configuration is in place to limit access to the