update README preview image

README.md

@@ -20,7 +20,7 @@
   <p align="center">
     <i>Simple json visualization tool for your data.</i>
   </p>
-  <img width="800" src="https://github.com/AykutSarac/jsonvisio.com/blob/main/public/jsonvisio.png" alt="preview 1" />
+  <img width="800" src="https://jsonvisio.com/jsonvisio-screenshot.png" alt="preview 1" />
 
   <p align="center">
     <h2 align="center">Support JSON Visio<h2>