Update README.md

Author: Ucas-HaoranWei

README.md

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 ## Release
-- [2025/x/x]🚀🚀🚀 We release DeepSeek-OCR, a model to investigate the role of vision encoders from an LLM-centric viewpoint.
+- [2025/10/20]🚀🚀🚀 We release DeepSeek-OCR, a model to investigate the role of vision encoders from an LLM-centric viewpoint.
 
 ## Contents
 - [Install](#install)