Is the goal still to keep schemdraw work with Python 3.8?

[bohrax]

First of all, thanks for this great library that I recently discovered!

When installing the latest version 0.20 using pip with Python 3.8, I got the following Traceback during import:

Python 3.8.10 (default, Mar 17 2025, 19:35:05) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import schemdraw
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/bohre/workspace/ui_docs/venv/python3/lib/python3.8/site-packages/schemdraw/__init__.py", line 1, in <module>
    from .schemdraw import Drawing, use, config, theme, debug
  File "/home/bohre/workspace/ui_docs/venv/python3/lib/python3.8/site-packages/schemdraw/schemdraw.py", line 11, in <module>
    from .elements import Element, Container
  File "/home/bohre/workspace/ui_docs/venv/python3/lib/python3.8/site-packages/schemdraw/elements/__init__.py", line 1, in <module>
    from .elements import Element, ElementDrawing, Element2Term
  File "/home/bohre/workspace/ui_docs/venv/python3/lib/python3.8/site-packages/schemdraw/elements/elements.py", line 17, in <module>
    from ..style import validate_color, validate_linestyle
  File "/home/bohre/workspace/ui_docs/venv/python3/lib/python3.8/site-packages/schemdraw/style.py", line 225, in <module>
    def validate_color(color: Union[str, bool, tuple[int,int,int], None]) -> None:
TypeError: 'type' object is not subscriptable
>>> 

I assume that this is due to usage of features introduced in later Python versions. It would be helpful to either tag it as requiring Python 3.9(?), or possibly rewrite it to work with Python 3.8 if that is still a design goal (I would be delighted if that was the case).

BTW 0.19 works well with Python 3.8.