Update README.md

GPT-4 browsing and plugin - Fixed HugChat and Bing

Upgrade with GPT-4 browsing and plugin

Delete ChatGPTAPI-unsafe.py

Delete ChatGPTAPI.py

Delete pyChatGPT.py

Fixed custom agent

Update and fix all free api endpoind hacked

Delete ChatGPTAPI-unsafe.py

Delete ChatGPTAPI.py

Delete pyChatGPT.py

By By cookie

Update HF agent

Add files via upload

Create thanks.txt