update README.md

Author: seyed-dev

README.md

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 <p align="center">
-  <img src="https://i.imgur.com/LIcqDY1.png" alt="Aggify">
+  <img src="https://i.imgur.com/LIcqDY1.png?3" alt="Aggify">
 </p>
 <p align="center">
     <em>Aggify is a Python library to generate MongoDB aggregation pipelines</em>