Update README.md (#5513)

Summary:
Link to v239 in both places it's mentioned.

Pull Request resolved: #5513

Test Plan: _eyes

Reviewed By: lawrencelomax

Differential Revision: D54848406

Pulled By: passy

fbshipit-source-id: c704b97c75117d17a1c1fa4fd910b3f247dca9e5

README.md

@@ -27,7 +27,7 @@ The last Electron release is [v0.239.0](https://github.com/facebook/flipper/rele
 
 ### React Native support
 
-If you are debugging React Native applications, v0.239.0 will be the last release with support for it due to technical limitations for React Dev Tools and Hermes Debugger plugins. As such, please refer to that release when debugging React Native applications.
+If you are debugging React Native applications, [v0.239.0](https://github.com/facebook/flipper/releases/tag/v0.239.0) will be the last release with support for it due to technical limitations for React Dev Tools and Hermes Debugger plugins. As such, please refer to that release when debugging React Native applications.
 
 ---