Update people.yml

Author: Jina-Kim

_data/people.yml

@@ -41,7 +41,7 @@ phd:
     image: images/people/malcolm.jpg
     profile: UMN CS&E
   - name: Yuankun Jiao
-    image: images/people/yuankun.jpeg
+    image: images/people/woman.png
     profile: UMN CS&E 
   - name: Theresa Chen
     image: images/people/theresa.jpg