Update README.md

Add warning on deadline for versions older than 3.0. After february 2025, ecoinvent-interface will stop working.
brightway-lca · Nov 25, 2024 · 7b98fce · 7b98fce
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 This is an **unofficial and unsupported** Python library to get ecoinvent data.
 
+> [!WARNING]  
+> 😯 Versions older than 3.0 of `ecoinvent-interface` will stop working as of February 2025.
+> Please update as soon as possible ❗
+
 # Quickstart
 
 ```python