add ptun as author

Author: bluenex

_data/authors.yml

@@ -33,6 +33,13 @@ bachkukkik:
     plus: +KrichkornOparad
   github: bachkukkik
 
+kittinan:
+  name: kittinan
+  web: https://github.com/kittinan
+  bio: "..."
+  avatar: avatar/ptun.png
+  github: kittinan
+
 panyavee:
   name: Panyavee
   email: p.panyavee@gmail.com