Update README.md

Author: ZhengyaoJiang

README.md

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 <div align="center">
 
-# Weco: The AI Research Engineer
+# Weco: The AI Code Optimizer
 
 [![Python](https://img.shields.io/badge/Python-3.8.0+-blue)](https://www.python.org)
 [![docs](https://img.shields.io/website?url=https://docs.weco.ai/&label=docs)](https://docs.weco.ai/)