fix PEP 484 prohibits implicit Optional

Author: BoboTiG

CHANGELOG

@@ -4,6 +4,7 @@ History:
 
 7.0.1   2022/10/27
       - fixed the wheel package
+      - MSS: fixed PEP 484 prohibits implicit Optional
 
 7.0.0   2022/10/27
       - added support for Python 3.11

mss/base.py

@@ -106,7 +106,7 @@ def save(
         self,
         mon: int = 0,
         output: str = "monitor-{mon}.png",
-        callback: Callable[[str], None] = None,
+        callback: Optional[Callable[[str], None]] = None,
     ) -> Iterator[str]:
         """
         Grab a screen shot and save it to a file.

mss/exception.py

@@ -2,12 +2,12 @@
 This is part of the MSS Python's module.
 Source: https://github.com/BoboTiG/python-mss
 """
-from typing import Any, Dict
+from typing import Any, Dict, Optional
 
 
 class ScreenShotError(Exception):
     """Error handling class."""
 
-    def __init__(self, message: str, details: Dict[str, Any] = None) -> None:
+    def __init__(self, message: str, details: Optional[Dict[str, Any]] = None) -> None:
         super().__init__(message)
         self.details = details or {}