fix sponsor link in readme

Author: wing328

README.md

@@ -75,7 +75,7 @@ If you find OpenAPI Generator useful for work, please consider asking your compa
 [<img src="https://openapi-generator.tech/img/companies/dm.png" width="128" height="128">](https://www.dotcom-monitor.com/sponsoring-open-source-projects/?utm_source=openapi-generator&utm_medium=sponsorship&utm_campaign=oss-sponsorship)
 [<img src="https://openapi-generator.tech/img/companies/clickit.jpg" width="128" height="128">](https://www.clickittech.com/?utm_source=openapi-generator&utm_medium=sponsorship&utm_campaign=oss-sponsorship)
 [<img src="https://openapi-generator.tech/img/companies/unified_to.jpg" width="128" height="128">](https://unified.to/?utm_source=openapi-generator&utm_medium=sponsorship&utm_campaign=oss-sponsorship)
-[<img src="https://openapi-generator.tech/img/companies/savetwt.jpg" width="128" height="128">](https://unified.to/?utm_source=openapi-generator&utm_medium=sponsorship&utm_campaign=oss-sponsorship)
+[<img src="https://openapi-generator.tech/img/companies/savetwt.jpg" width="128" height="128">](https://savetwt.com/?utm_source=openapi-generator&utm_medium=sponsorship&utm_campaign=oss-sponsorship)
 
 #### Thank you GoDaddy for sponsoring the domain names, Linode for sponsoring the VPS, Checkly for sponsoring the API monitoring and Gradle for sponsoring Develocity