add contributor

Author: dingyiming

themes/vue/layout/partials/contributors.ejs

@@ -148,6 +148,12 @@ new Vue({
           github: 'bringtree'
         },{
           github: 'lihengming'
+        },{
+          github: 'iHelin'
+        },{
+          github: 'kiyonlin'
+        },{
+          github: 'xqin'
         }
       ]
     };