Update README.md

Author: rebuild-123

README.md

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 # Python Head First Design Patterns 
 ## Chapters 
-[chapter 1](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/strategy)-"challenge" has not been translated yet 
-[chapter 2](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/observer)-done 
-[chapter 3](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/decorator)-done 
+[chapter 1](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/strategy)-done (Only challenge has no translation.) 
+[chapter 2](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/observer)-done (Only swing has no translation.)  
+[chapter 3](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/decorator)-done (Only io has no translation.)  
 [chapter 4](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/factory)-done 
 [chapter 5](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/singleton)-done 
 [chapter 6](https://github.com/rebuild-123/Python-Head-First-Design-Patterns/tree/main/command)-in translation