docs: add zyner as a gold sponsor

README.md

@@ -35,6 +35,7 @@ Your support will be really appreciated by me and other supporters!
 [![nodion](https://raw.githubusercontent.com/seaweedfs/seaweedfs/master/note/sponsor_nodion.png)](https://www.nodion.com)
 [![piknik](https://raw.githubusercontent.com/seaweedfs/seaweedfs/master/note/piknik.png)](https://www.piknik.com)
 [![keepsec](https://raw.githubusercontent.com/seaweedfs/seaweedfs/master/note/keepsec.png)](https://www.keepsec.ca)
+[![zyner](https://raw.githubusercontent.com/seaweedfs/seaweedfs/master/note/sponsor_zyner.png)](https://zyner.org)
 
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