docs: update sponsors

***NO_CI***

README.md

@@ -284,5 +284,5 @@ This project exists thanks to all the people who contribute. [[Contribute]](http
 ![Netlify](https://wiki.js.org/legacy/logo_netlify.png)  
 [Netlify](https://www.netlify.com) for providing hosting for landings and blog websites.
 
-![Porkbun](https://static.requarks.io/logo/porkbun.svg)  
+![Porkbun](https://static.requarks.io/logo/porkbun.png)  
 [Porkbun](https://www.porkbun.com) for providing domain registration services.