v0.9.0

Cover the remaining changes since 0.8.0 in the release notes

Auditing the 34 commits since v0.8.0 against the 0.9.0 section turned up
user-visible changes with no entry:

- keyword completion silently returning an empty list (f34590e)
- quote-style-aware and naturally sorted name completion (98f9809)
- configurable record/heading indent and single-row table alignment,
  including two new settings (be64984)
- heading-aware column alignment (ad63396)

All 18 declared settings were already documented; no gaps there.