update chapter4

README.md

@@ -138,7 +138,7 @@
 ## Star History
 
 <div align='center'>
-    <img src="./docs/images/star-history-20251022.png" alt="Datawhale" width="90%">
+    <img src="./docs/images/star-history-20251021.png" alt="Datawhale" width="90%">
 </div>
 
 <div align="center">

docs/README.md

@@ -134,7 +134,7 @@
 ## Star History
 
 <div align='center'>
-    <img src="./images/star-history-20251022.png" alt="Datawhale" width="90%">
+    <img src="./images/star-history-20251021.png" alt="Datawhale" width="90%">
 </div>
 
 <div align="center">