Update README.md

Author: bnasslahsen

README.md

@@ -5,8 +5,9 @@
 [![Stack Exchange questions](https://img.shields.io/stackexchange/stackoverflow/t/springdoc)](https://stackoverflow.com/questions/tagged/springdoc?tab=Votes)
 
 `springdoc-openapi` is on [Open Collective](https://opencollective.com/springdoc).
-If you ❤️ this project consider becoming
-a [sponsor](https://github.com/sponsors/springdoc).
+If you ❤️ this project consider becoming a [sponsor](https://github.com/sponsors/springdoc).
+If you already use the `springdoc-openapi, do not forget adding a ***github star*** to this repository.
+
 
 This project is sponsored by