Update README.md

Author: cocoindex-dev

README.md

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 </div>
 
 CocoIndex is the world's first open-source engine that supports both custom transformation logic and incremental updates specialized for data indexing.
 <p align="center">
-    <img src="https://cocoindex.io/images/venn.svg" alt="CocoIndex">
+    <img src="https://cocoindex.io/images/cocoindex-features.png" alt="CocoIndex Features">
 </p>
 With CocoIndex, users declare the transformation, CocoIndex creates & maintains an index, and keeps the derived index up to date based on source update, with minimal computation and changes.