Update README.md

README.md

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 新版正方系统 Python SDK。(支持自动识别、处理滑块验证码与常规验证码，如果觉得还不错,给个小星星趴~⭐)
 
+> 这也许是全网唯一一个自动处理新版教务系统验证码的 SDK :p
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