Merge branch 'patch-3' into 'master'

更新 README.md See merge request !5

Merge branch 'patch-3' into 'master'
cb26b9cd · 李川 · 185f8954 · c5f7ea4e · cb26b9cd
--- a/README.md
+++ b/README.md
 # 说明
 Intel 8255 可编程并行接口芯片
 # 原理图
-![8255](8255.dlsche.svg)
+![raw svg](8255.dlsche.svg)
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