paper/README.md tells a visitor that ltl.pdf is the submitted version
frozen during review, that v0.1/v0.2 are superseded history, and that
v0.3-v0.9 live in git history. Also corrects the stale web.py comment
that labeled the live pdf 'v0.3 reinvention' (it is the v0.9 submitted
version). No served bytes change; the comment fix reaches the droplet
with the next routine app update.
