change the position of huihao and wenbin

Author: Egbertjing

data/people.yaml

@@ -25,14 +25,14 @@
   affiliation: "HKUST"
 
 - name: "Wenbin Hu"
-  role: "Research Assistant"
+  role: "Mphil Student"
   homepage: "https://whuak.github.io"
   photo: "images/WenbinHu.png"
   affiliation: "HKUST"
 
 
 - name: "Huihao Jing"
-  role: "Research Assistant"
+  role: "Mphil Student"
   homepage: "https://egbertjing.github.io/"
   photo: "images/huihaojing.jpg"
   affiliation: "HKUST"