Update README.md

README.md

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 # WP-FastEndpoints
 
-<img src="https://raw.githubusercontent.com/matapatos/wp-fastendpoints/main/docs/images/wp-fastendpoints-wallpaper.png" alt="WordPress REST endpoints made easy">
+<img src="https://raw.githubusercontent.com/matapatos/wp-fastendpoints/main/docs/images/wp-fastendpoints-wallpaper.svg" alt="WordPress REST endpoints made easy">
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