There have been no changes since the 8.x-1.0-rc2 release.
This release is compatible with Drupal 9.
If you are migrating from Drupal 6 or Drupal 7, then the Typogrify filter will be added to migrated text formats if it was used in the source format.
If you are migrating from Drupal 7, then configuration should be migrated correctly. If you are migrating from Drupal 6, then the filter will be enabled with its default configuration.
If you are upgrading from Typogrify 8.x-10.-rc1 or earlier, then make sure to run database updates.