Fix README.md, make some modifications based on the official website

Author: zinzoddari

README.md

@@ -4,14 +4,14 @@
 [![Known Vulnerabilities](https://snyk.io/test/github/springdoc/springdoc-openapi.git/badge.svg)](https://snyk.io/test/github/springdoc/springdoc-openapi.git)
 [![Stack Exchange questions](https://img.shields.io/stackexchange/stackoverflow/t/springdoc)](https://stackoverflow.com/questions/tagged/springdoc?tab=Votes)
 
-IMPORTANT: ``springdoc-openapi v1.7.0 `` is the latest Open Source release supporting Spring Boot 2.x and 1.x. 
+IMPORTANT: ``springdoc-openapi v1.8.0`` is the latest Open Source release supporting Spring Boot 2.x and 1.x. 
 
 An extended support for [*springdoc-openapi v1*](https://springdoc.org/v1) 
 project is now available for organizations that need support beyond 2023. 
 
-For more details, feel free to reach out: sales@springdoc.org
+For more details, feel free to reach out: [sales@springdoc.org](mailto:sales@springdoc.org)
 
-If you ❤️ this project consider becoming
+``springdoc-openapi`` is on [Open Collective](https://opencollective.com/springdoc). If you ❤️ this project consider becoming
 a [sponsor](https://github.com/sponsors/springdoc).
 
 This project is sponsored by