Update SECURITY.md - huntr is dead

Author: splitbrain

SECURITY.md

@@ -10,7 +10,6 @@ We try to fix vulnerabilites as fast as possible, but please keep in mind that t
 
 You have multiple options on reporting vulnerabilities
 
-* Use [huntr.dev](https://www.huntr.dev/repos/dokuwiki/dokuwiki)
 * Send an e-mail to [Andi](mailto:[email protected])
 * Open a [Github Issue](https://github.com/dokuwiki/dokuwiki/issues)
 * Send a mail to the [Mailing List](https://www.dokuwiki.org/mailinglist)