update

Author: liangliang6v6

_data/phd.yml

@@ -54,7 +54,7 @@
   education4: 
   education5:
   website: https://liangliang6v6.github.io/
-  linkedin: 0
+  linkedin: https://www.linkedin.com/in/liangliang-zhang-9a4b19239/
   twitter: 0
   github: https://github.com/liangliang6v6