Sponsors: VPS2day has been rebranded to servinga

Signed-off-by: Nicola Murino <[email protected]>

README.md

@@ -41,7 +41,7 @@ It is important to understand that you should support SFTPGo and any other Open
 
 [<img src="./img/7digital.png" alt="7digital logo" width="178" height="56">](https://www.7digital.com/)
 </br></br>
-[<img src="./img/vps2day.png" alt="VPS2day logo" width="234" height="56">](https://www.vps2day.com/)
+[<img src="./img/servinga.png" alt="servinga logo" width="258" height="56">](https://servinga.com/)
 
 ## Support