Update README.md

Author: justserpapi

README.md

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 <p align="center">
-  <img src="https://justserpapi.com/logo/whiteBgColor.png" alt="JustSerpAPI Logo" width="200">
+  <img src="https://justserpapi.com/logo/whiteBgColor.webp" alt="JustSerpAPI Logo" width="200">
 </p>
 
 <h1 align="center">JustSerpAPI Python SDK</h1>