Update app.py

app.py

@@ -101,6 +101,7 @@ This demo is based on the following work:
 *Karkkainen, K., & Joo, J. (2021).*
 FairFace: Face Attribute Dataset for Balanced Race, Gender, and Age for Bias Measurement and Mitigation. 
 In Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision (pp. 1548-1558).
+See: https://github.com/joojs/fairface
 """
  
 gr.Interface(