added gravitee as project sponsor

README.md

@@ -101,9 +101,9 @@ Thank you to our project  sponsors.
 <hr />
 
 <div align="center">
-  <img alt="hookdeck" src="./images/sponsors/gravitee-logo-black.svg" width="50%" />
+  <img alt="gravitee" src="./images/sponsors/gravitee-logo-black.svg" width="50%" />
   <p style="margin: 0; padding: 0;">Manage, secure, and govern every API in your organization</p>
-  <a href="https://www.gravitee.io/?ref=eventcatalog-sponsor" target="_blank" >Learn more</a>
+  <a href="https://gravitee.io?utm_source=eventcatalog&utm_medium=web&utm_campaign=sponsorship" target="_blank" >Learn more</a>
 </div>
 
 <hr />