Update README.md

fabiocav · web-flow · commit a7f319a0c29b · 2025-02-20T13:20:12.000-08:00
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+> [!IMPORTANT]  
+> This project is in maintenance mode and will receive no further feature updates. See [Notice: This OpenAPI extension project is in maintenance mode](https://github.com/Azure/azure-functions-openapi-extension/issues/683) for more information.
+
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 # Azure Functions OpenAPI Extension #
 
 | Out-of-Proc Worker | In-Proc Worker |
