See last link for the details about the following highlights since 9.0.0:
- #3326. Fix argument remapping. Limit remapping to first argument.
- #3334, #3335. Make SiteInstallCommands::getSitesSubdirFromUri find dir from sites.php
- #3340. Refactor so that SqlTableSelectionTrait.php is usable by non SqlBase classes.
- #3339. Expand Unish (system tests) to more PHP versions (including 7.2). Start using Circle 2.0 more.
- #3344. Improve sql-sanitize - sanitize passwords by default
- Changes since 9.0.0.