Update README [ci skip]

Added Kinsta as a new sponsor in the README.

Author: retlehs

README.md

@@ -16,7 +16,7 @@ We're dedicated to pushing modern WordPress development forward through our open
 
 ### Sponsors
 
-<a href="https://carrot.com/"><img src="https://cdn.roots.io/app/uploads/carrot.svg" alt="Carrot" width="120" height="90"></a> <a href="https://wordpress.com/"><img src="https://cdn.roots.io/app/uploads/wordpress.svg" alt="WordPress.com" width="120" height="90"></a> <a href="https://www.itineris.co.uk/"><img src="https://cdn.roots.io/app/uploads/itineris.svg" alt="Itineris" width="120" height="90"></a> <a href="https://bonsai.so/"><img src="https://cdn.roots.io/app/uploads/bonsai.svg" alt="Bonsai" width="120" height="90"></a>
+<a href="https://carrot.com/"><img src="https://cdn.roots.io/app/uploads/carrot.svg" alt="Carrot" width="120" height="90"></a> <a href="https://wordpress.com/"><img src="https://cdn.roots.io/app/uploads/wordpress.svg" alt="WordPress.com" width="120" height="90"></a> <a href="https://www.itineris.co.uk/"><img src="https://cdn.roots.io/app/uploads/itineris.svg" alt="Itineris" width="120" height="90"></a> <a href="https://kinsta.com/?kaid=OFDHAJIXUDIV"><img src="https://cdn.roots.io/app/uploads/kinsta.svg" alt="Kinsta" width="120" height="90"></a>
 
 ## Quick Install (macOS and Linux via Homebrew)