Update ch03.md

replace images link
tianmingyun · Apr 14, 2024 · 3c7aa7e · 3c7aa7e
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@@ -7,7 +7,7 @@ Bitcoin是一个开源项目，源代码使用开放（MIT）授权，可免费
 
 下图为Bitcoin Core的架构。
 
-![图3-1](https://github.com/bitcoinbook/bitcoinbook/raw/develop/images/mbc2_0301.png)
+![图3-1](https://github.com/bitcoinbook/bitcoinbook/raw/second_edition_print3/images/mbc2_0301.png)
 
 图3-1 比特币核心架构（来源：Eric Lombrozo）