Update README.md

README.md

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-beautiful-racket
+## beautiful-racket
--
+
 
 Resources for the “Beautiful Racket” book, including:
 
@@ -10,24 +10,25 @@ Resources for the “Beautiful Racket” book, including:
 * sample languages
 
 
-Installation
+## Installation
--
 
 `raco pkg install beautiful-racket`
 
 
-Update
+## Update
--
 
 `raco pkg update  --update-deps beautiful-racket`
 
-Documentation
+## Documentation
--
 
 http://docs.racket-lang.org/br
 
 
-License
+## License
--
 
 MIT
+
+
+## Project status
+
+Complete. I will maintain the code but no major updates are planned.