Python 3.8 support

[Minyus]

Thank you for your awesome tool!
I'd appreciate it if Python 3.8 is supported as well.

[kjmatsuda]

Hi, thank you for sharing such a great tool!

I propose to support 'wanna' in Python >= 3.8.
It seems to me that poetry.lock shows no dependency above Python 3.10 or above.

My environment is as below:

$ python3 --version
Python 3.8.10

$ lsb_release  -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.4 LTS
Release:        20.04
Codename:       focal

'wanna' works fine on my environment, too.

2023-03-30-07-36-04.mp4

Such a great tool should be available to more users.
How do you think?