Update README.md

Author: xbubbo

README.md

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 <div align="center">
     <img src="https://raw.githubusercontent.com/UseInterstellar/Interstellar/main/.github/branding/in.png">
-    <p>Serving over 8+ million users since 2023.<p>
+    <p>Serving over 15 million users since 2022.<p>
     <p>Interstellar is a web proxy with a Clean and Sleek UI and easy to use menus. Our goal is to provide the best user experience to everyone.</p>
 </div>