Added backwards compatibility with python 3.10

src/encoder/records/attributes.py

@@ -1,5 +1,5 @@
 import struct
-from typing import Self
+from typing_extensions import Self
 
 from .datatypes import MultiByteInt31, Utf8String
 from .constants import DICTIONARY

src/encoder/records/datatypes.py

@@ -1,7 +1,7 @@
 import logging
 import struct
 
-from typing import Self
+from typing_extensions import Self
 
 log = logging.getLogger(__name__)
 

src/encoder/records/elements.py

@@ -1,5 +1,5 @@
 import struct
-from typing import Self
+from typing_extensions import Self
 
 from .constants import DICTIONARY
 from .datatypes import MultiByteInt31, Utf8String

src/encoder/records/record.py

@@ -1,6 +1,6 @@
 import struct
 
-from typing import Self, Type
+from typing_extensions import Self, Type
 
 import logging as log
 

src/encoder/records/text.py

@@ -2,7 +2,7 @@ import base64
 import datetime
 import struct
 from html.entities import codepoint2name
-from typing import Self
+from typing_extensions import Self
 
 from .constants import DICTIONARY
 from .datatypes import Decimal, MultiByteInt31