Critical bug: not compatible with interface

Urgently remove "final" in **src/DocBlock/Tags/TagWithType.php** ln. 33, see more description in commit

[more info here](https://github.com/phpDocumentor/ReflectionDocBlock/commit/fba45a37189a12ff98089e73c0f42429885f0541#diff-5dcabb33b051cf7b7e35a9a829ba75c35cc0f43fb852de241a5ae736930bf75c)