Update README.md

README.md

 # Copula-based conformal bounding box prediction
 
 ## Full report
-- [Copula-based conformal prediction for object detection:  a more efficient approach](COPA2024.pdf)
+- [Copula-based conformal prediction for object detection:  a more efficient approach](full_report.pdf)
 
 <!-- 🚩  - Checkout demo.ipynb for more details about the results ⚠️ -->