See the Versioning README for more details on framework versions in general.
- Modules are no longer allowed to include Twig as a dependency. If your module includes Twig as dependency, remove it and use the built-in Twig version described below instead. If you're coming from Twig major version 1 or 2, you may have to make some changes for your module to support Twig version 3.
- Twig Templating Engine version 3 is now included in the External Module Framework. More details, see the Twig documentation page.