Update notice of document status

README.md

@@ -35,9 +35,8 @@ You can email us at `dosp-research {_AT_} opensource.org` or [file a
 ticket](https://code.librehq.com/ots/dosp-research/-/issues/new) to
 contact us.
 
-To build the whitepaper from LaTeX source, you will need to use
-[OTS DocTools](https://code.librehq.com/ots/ots-doctools).
-
-Just kidding -- the whitepaper doesn't exist yet.  Instead, we have
-this free-form [notes file](notes.md).  For now, that's the right
-landing place for contributions.
+To build the whitepaper from LaTeX source, you will need to use [OTS
+DocTools](https://code.librehq.com/ots/ots-doctools).  ***Note that
+the whitepaper is still a work in progress.  Please do not cite the
+draft nor quote from it in public forums yet.***  We'll remove
+this notice when the paper is ready for publication.