Correct link to Sebastien's profile

Author: Jamie Tanna

README.md

@@ -35,7 +35,7 @@ Check out the examples in [the package documentation on pkg.go.dev](https://pkg.
 ## Credits
 
 - [KumanekoSakura](https://github.com/KumanekoSakura), [via](https://github.com/golang/go/issues/64515#issuecomment-1841057182)
-- [Sebastien Guilloux], [via](https://github.com/sebgl/nullable/)
+- [Sebastien Guilloux](https://github.com/sebgl), [via](https://github.com/sebgl/nullable/)
 
 As well as contributions from: