update related research

README.md

@@ -85,10 +85,10 @@ python -m apps.train_color --dataroot {path_to_training_data} --num_sample_inout
 
 ## Related Research
 
-[Multi-Level Pixel-Aligned Implicit Function for High-Resolution 3D Human Digitization (CVPR 2020)](https://shunsukesaito.github.io/PIFu/)  
+[PIFuHD: Multi-Level Pixel-Aligned Implicit Function for High-Resolution 3D Human Digitization (CVPR 2020)](https://shunsukesaito.github.io/PIFuHD/)  
 Shunsuke Saito, Tomas Simon, Jason Saragih, Hanbyul Joo
 
-We further improve the quality of reconstruction by leveraging multi-level approach! 
+We further improve the quality of reconstruction by leveraging multi-level approach!
 
 [Learning to Infer Implicit Surfaces without 3d Supervision (NeurIPS 2019)](http://papers.nips.cc/paper/9039-learning-to-infer-implicit-surfaces-without-3d-supervision.pdf)  
 Shichen Liu, Shunsuke Saito, Weikai Chen, Hao Li