Add new line

Author: andreaponti5

parse_document_model/attributes.py

@@ -33,4 +33,4 @@ class TextAttributes(Attributes):
     def check_level(cls, v) -> int:
         if v is not None and v not in range(1, 5):
             raise ValueError("Level must be between 1 and 4 or None")
-        return v
+        return v