docs: update readme (#105)

Author: tomsun28

README.md

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+**The [New Python SDK](https://github.com/zai-org/z-ai-sdk-python) for Z.AI and ZhipuAI has released: [z-ai-sdk-python](https://github.com/zai-org/z-ai-sdk-python)!** It is recommended to use this SDK for better, faster, and long-term support.
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 # ZhipuAI Open Platform Python SDK
 
 [![PyPI version](https://img.shields.io/pypi/v/zhipuai.svg)](https://pypi.org/project/zhipuai/)

README_CN.md

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+Z.AI 和 智谱AI 的 [全新 Python SDK](https://github.com/zai-org/z-ai-sdk-python) 已经发布：[z-ai-sdk-python](https://github.com/zai-org/z-ai-sdk-python)！推荐使用此 SDK，以获得更好、更快的长期支持。
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 # 智谱AI开放平台 Python SDK
 
 [![PyPI version](https://img.shields.io/pypi/v/zhipuai.svg)](https://pypi.org/project/zhipuai/)