Update README.md

README.md

-![Goku API Gateway](https://data.eolinker.com/course/TqmXQcg774033e5836ed04f741cfe8e584e5eed1a806a7c "Goku API Gateway")
+![GOKU API Gateway](https://data.eolinker.com/course/6HlFXxbc2833947dbfa6840bbba348714dfbe33018fd6cc "GOKU API Gateway")
 
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