trigger rebuild

Author: LingDong-

README.md

@@ -18,7 +18,7 @@
 
 [![](assets/screenshots/screenshot001.png)](https://book.wy-lang.org)
 
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+ 
 ## Download PDF
 
 ### 【[Relic Edition](https://github.com/wenyan-lang/book/releases)】【[Remastered Edition](assets/wenyan-book.pdf)】