add line about vulnerabilities (firefox-devtools#4231)

README.md

@@ -47,6 +47,9 @@ say hi in [slack] and a team member would be happy to mentor you.
 
 We strive for collaboration with [mutual respect for each other][contributing]. Mozilla also has a set of [participation guidelines] which goes into greater detail specific to Mozilla employees and contributors.
 
+Or, perhaps you have found a vulnerability in the debugger and want to report it? in that case, take
+a look at [how we handle security bugs over][vulnerabilities], and open a bug at [Bugzilla][bugzilla] so we can track it while keeping users safe!
+
 ### Development Guide
 
 We strive to make the Debugger as development friendly as possible. If you have a question that's not answered in the guide, ask us in [slack]. We also :heart: documentation PRs!
@@ -115,6 +118,8 @@ Say hello in [slack] or in the [#devtools-html][irc-devtools-html] channel on ir
 [irc-devtools-html]: irc://irc.mozilla.org/devtools-html
 [community-call]: https://hangouts.google.com/hangouts/_/calendar/amFzb24ubGFzdGVyLjExQGdtYWlsLmNvbQ.30mdpa6ncqn8uttvmrj9b9d3jc
 [devtools-call]: https://wiki.mozilla.org/DevTools
+[bugzilla]: https://bugzilla.mozilla.org/query.cgi
+[vulnerabilities]: https://www.mozilla.org/en-US/about/governance/policies/security-group/bugs/
 [vidyo]:https://v.mozilla.com/flex.html?roomdirect.html&key=n9vJUD3L1vRMHKQC5OCNRT3UBjw
 [changelog]: https://changelog.com/podcast/247
 [docs]: https://devtools-html.github.io/debugger.html/docs/