PIP: <PIP number>
Title: <PIP title>
Authors: <list of authors' real names and optionally, email addrs>
Status: [ Draft | Accepted | Installed | Withdrawn | Deferred | Rejected | Superseded ]
Type: [ Informational | Protocol ]
Created: <date created on, in ISO 8601 (yyyy-mm-dd) format>
Discussion: <url>
Replaces: <PIP number> (optional)
Superseded-By: <PIP number> (optional)
Worker: <Id of worker proposal> (optional)