README Update Suggestion

Hello, I've been working with BitstreamEvolution for a bit and wanted to note a possible inconsistency with the README, as it may help future people who use the repo.

Specifically, the README states that BitstreamEvolution requires Python version 3.7 or higher. Personally, I encountered an error when running evolve.py when using Python 3.8:

This was thrown for the Circuit.py file, line 33

in Circuit def get_bitstream(self) -> list[int]: TypeError: 'type' object is not subscriptable

After looking up the issue, it seemed like this is a type hinting feature only supported by Python version 3.9 and higher. This was confirmed when the issue went away for me after switching to Python 3.9. Would making this change to the README be helpful?

Vérifiez la version requise de Python dans README et comparez-la avec l’annotation de type signalée à la ligne 33 de Circuit.py lorsque evolve.py s’exécute sous Python 3.8. C’est terminé lorsque README indique correctement la version minimale de Python prise en charge et reflète la exigence observée.

Rédigé par le modèle d'indexation à partir du texte de l'issue.