Fix outdated link to security guidelines (#4018)

The link linked to a section that does not exist anymore.
I guess this is the correct place to link to, now.

Author: rklec

README.md

@@ -101,7 +101,7 @@ on diagnosing and reporting issues.
 
 ## Security Note
 
-For any security issues, please see [here](./docs/troubleshooting.md#note-on-security).
+For any security issues, please see [here](./SECURITY.md).
 
 ## Example Scripts