Refresh README image (#18194)

| Q               | A
|-----------------|-----
| Branch?         | 2.1 <!-- see the comment below -->
| License         | MIT

Author: GSadee

README.md

@@ -1,6 +1,6 @@
 <h1 align="center">
     <a href="https://sylius.com/github-readme/link/" target="_blank">
-        <img src="https://sylius.com/assets/github-readme.png?1" />
+        <img src="https://sylius.com/assets/github-readme.png?2" />
     </a>
 </h1>