Add email aliases for acting as CNA
Add email aliases for acting as CNA

Add email aliases for acting as a CNA asas per:
https://github.com/nodejs/security-wg/issues/33

cve-request  - email address that people should be directed to
               in order to ask questions about CVE-related issues.

cve-mitre-contact - private contact points for mitre to reach out
                    directly to in case there are issues that required
                    immediate attention.

cna-discussion-list - email address added ot the CNA email discussion
                      list.  Used for announcements, sharing documents
                      or discussion relevant to CNA community. Rarely
                      has more than 10 messages a week.

PR-URL: https://github.com/nodejs/email/pull/71
Reviewed-By: Sam Roberts <266bbf644f3674ab209c4709d090256bac1c7bb7@gmail.com>

nodejs/email,joaocgreis/email,janeasystems/email