Add async support

[NerdzzyDev]

"Hi, friend! Thank you for this project - it's been incredibly helpful in finding working proxies. However, I've noticed that it tends to run quite slowly. That's why I took the initiative to introduce asynchrony support, which has significantly improved its performance. I haven't made any modifications to the installation files or provided enough updates in the readme. I hope you can help me with that. Thank you!"