Update site configuration

Author: MatrixCQY

_config.yml

@@ -28,7 +28,7 @@ author:
   avatar           : "profile.png"
   name             : "Qiyang CHENG"
   pronouns         : # example: "she/her"  
-  bio              : "UG in Fudan"
+  bio              : "UG at Fudan"
   location         : "Shanghai, China"
   employer         : "Fudan University"
   uri              : # URL