Remove deprecated version and identifier parameters

pydyf/__init__.py

@@ -467,16 +467,8 @@ def data(self):
 
 class PDF:
     """PDF document."""
-    def __init__(self, version=None, identifier=None):
+    def __init__(self):
         """Create a PDF document."""
-        if version or identifier:  # to be removed in next version
-            warn(
-                "PDF objects don’t take version or identifier during initialization "
-                "anymore. These properties are now stored but ignored, and will be "
-                "removed and rejected in next version of pydyf. Please pass these "
-                "properties to the PDF.write() method instead.", DeprecationWarning)
-        self.version = _to_bytes(version) if version else b'1.7'  # to be removed
-        self.identifier = identifier  # to be removed
 
         #: Python :obj:`list` containing the PDF’s objects.
         self.objects = []