This is an official stable release of the 3.1.0b branch and only contains some code styling and documentation adjustments.
For a full changelog, please refer to the 3.1.0b release:
https://github.com/FujiMakoto/twitter-saucenao/releases/tag/3.1.0b
This release includes breaking changes and configuration updates. Please review the changelog before upgrading.
You will either need to delete the database you are currently using and allow SauceBot to generate a new one (models/database.sqlite if you are using the default configuration), or run the query specified in the changelog above.
Proper migration scripts will hopefully be added in a future release.