doc: updated SECURITY with a link to reporting via Github

Author: decalage2

SECURITY.md

@@ -15,12 +15,15 @@ currently being supported with security updates:
 ## Reporting a Vulnerability
 
 If you would like to report a vulnerability affecting the oletools project,
-please send a first email to decalage at laposte dot net, without giving
-technical details. You will then be provided with a GPG key to send
+you may use the link "[Report a vulnerability](https://github.com/decalage2/oletools/security/advisories/new)" 
+on Github. 
+
+If you prefer not to use Github, please send a first email to decalage at laposte dot net, without giving
+technical details. You will then be provided with a GPG public key to send
 encrypted emails.
 
 Alternatively you may also contact me via X/Twitter, Mastodon or BlueSky
-using private messages (see https://linktr.ee/decalage).
+using private messages (see https://linktr.ee/decalage) to get the GPG key.
 
 Please note that oletools is a non-commercial open-source project maintained 
 on my spare time. I will do my best to answer in due time and fix