Python dependency 3.9 is wrong.

[codekandis]

I'm currently installing circup 2.3.0 with my system Python 3.9.x.

circup throws an exception on showing its version

$ circup --version
Traceback (most recent call last):
  File "/home/user/.local/bin/circup", line 3, in <module>
    from circup import main
  File "/home/user/.local/pipx/venvs/circup/lib/python3.9/site-packages/circup/__init__.py", line 9, in <module>
    from circup.shared import DATA_DIR, BAD_FILE_FORMAT, extract_metadata, _get_modules_file
  File "/home/user/.local/pipx/venvs/circup/lib/python3.9/site-packages/circup/shared.py", line 16, in <module>
    from circup.lazy_metadata import LazyMetadata
  File "/home/user/.local/pipx/venvs/circup/lib/python3.9/site-packages/circup/lazy_metadata.py", line 11, in <module>
    class LazyMetadata:
  File "/home/user/.local/pipx/venvs/circup/lib/python3.9/site-packages/circup/lazy_metadata.py", line 20, in LazyMetadata
    initial_data: dict[str, Any] | None = None,
TypeError: unsupported operand type(s) for |: 'types.GenericAlias' and 'NoneType'

The union type orperator | is a Python >= 3.10 feature.

[FoamyGuy]

Thanks for reporting. We will update the minimum to 3.10.

Python 3.9 is past end of life and no longer receiving security patches, so it can be risky to continue using it. https://devguide.python.org/versions/

[codekandis]

Your README still needs an update.

[FoamyGuy]

@codekandis thank you. That is fixed in #268