Added

• [PHP 8.0] Added support for trailing commas in parameter lists.
• [PHP 8.0] Added support for constructor promotion. The parameter visibility is stored in Node\Param::$flags.

Fixed

• Comment tokens now always follow the PHP 8 interpretation, and do not include trailing whitespace.
• As a result of the previous change, some whitespace issues when inserting a statement into a method containing only a comment, and using the formatting-preserving pretty printer, have been resolved.