Fix Gitpod online tutorial link in README.md

Author: jankeromnes

README.md

@@ -73,7 +73,7 @@ After this is complete, the application will be deployed on port `3000`. Open a
 
 You can also run this tutorial in Gitpod, a free online dev environment for GitHub:
 
-[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://github.com/tyroprogrammer/learn-react-app/blob/master/src/exercise/01-HelloWorld.js)
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/tyroprogrammer/learn-react-app/blob/master/src/exercise/01-HelloWorld.js)
 
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@@ -140,4 +140,4 @@ If you went through the exercise and saw some inconsistencies or if you have an
 [github-commit]: https://github.com/tyroprogrammer/learn-react-app/commits/master
 [github-contributors-badge]: https://img.shields.io/github/contributors/tyroprogrammer/learn-react-app.svg?style=social
 [github-contributors]: https://github.com/tyroprogrammer/learn-react-app/graphs/contributors
-<!-- prettier-ignore-end -->
+<!-- prettier-ignore-end -->