Andreas is continually updated the app – several times a day, most days. Documentation lags when development is rapid.
I think the Version History is only updated for full releases.
Andreas puts some alpha upgrade notes in this Topic (as instructed, scroll to the bottom), but there are still numerous small updates/upgrades that aren't documented.
Afaik, the most recent documentation is always shown at "{BTT menubar icon} ▹ Release Notes and Documentation".