Update README.md

Author: alesanchezr

README.md

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 Complete selection of autograded CSS exercises, anyone interested in learning CSS!
 
-[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io#https://github.com/4GeeksAcademy/css-exercises.git)
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io#https://github.com/4GeeksAcademy/css-tutorial-exercises-course.git)
 
 During this course you will be learning the following concepts: