Following on from having read http://www.jonobacon.org/2017/02/09/hackerone-professional-free-open-source-projects/ I think we should add something like a SECURITY.md (not necessarily to be part of the hackerone program) -- "Create a policy – you add a SECURITY.md in your project root that provides details for how to submit vulnerabilities "
Referenced example is https://github.com/discourse/discourse/blob/master/docs/SECURITY.md