docs: add automatic state restoration to features list in README.md

Author: Netsnake-TN

README.md

@@ -32,6 +32,8 @@ A Material Design 3 Expressive Pull-to-Refresh component for Android. Provides t
 
 - **Runtime Style Switching** - Change indicator styles dynamically
 
+- **Automatic State Restoration** - Automatically preserves refreshing state during configuration changes (e.g., rotation)
+
 ---
 
 ## 🎬 Preview