Update people.yml

Author: yaoyichi

_data/people.yml

@@ -76,8 +76,8 @@ phd-alumni:
     image: images/people/zekun_li.png
     profile: UMN CS&E
     link: https://zekun-li.github.io/
-  - name: Henry Hu
-    image: images/people/man.png
+  - name: Haoji Hu
+    image: images/people/haoji_hu.jpg
     profile: Ph.D. <br> UMN CS&E
   - name: Weiwei Duan
     image: images/people/weiwei_duan.jpg