doc: python version

README.md

@@ -29,7 +29,7 @@ Feel free to provide feedback in [issues](https://github.com/Byaidu/PDFMathTrans
 
 ## Installation
 
-Require Python version <=3.12
+Require Python version >=3.8, <=3.12
 
 ```bash
 pip install pdf2zh

README_zh-CN.md

@@ -29,7 +29,7 @@ PDF 文档翻译及双语对照
 
 ## 安装
 
-要求 Python 版本 <=3.12
+要求 Python 版本 >=3.8, <=3.12
 
 ```bash
 pip install pdf2zh