Update README.md

2.13inch_e-paper_code/README.md

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 # 2.13inch e-Paper
 
 ## 2.13inch e-Paper
-![2.13inch-e-Paper-intro.JPG](2.13inch-e-paper-intro.JPG)
+![2.13inch-e-Paper-intro.JPG](2.13inch-e-paper-intro.jpg)
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 中文：
 上传的仅为树莓派驱动程序：