docs: add acknowledgment for contributions from @Testudinidae

Daydreamer-riri · Daydreamer-riri · commit 822383ee1a59 · 2026-02-02T11:46:14.000+08:00
diff --git a/README.md b/README.md
@@ -100,6 +100,7 @@ PRs welcome!
 ## Thanks
 
 Thank you to [@thatgaypigeon](https://github.com/thatgaypigeon) for writing the excellent documentation!
+Thank you to [@Tortoise](https://github.com/Testudinidae) for making many very useful refactorings and improvements to this project!
 
 ## License
 
