docs: update .all-contributorsrc

.all-contributorsrc

@@ -23,6 +23,16 @@
         "code",
         "maintenance"
       ]
+    },
+    {
+      "login": "seanzhang98",
+      "name": "Sean",
+      "avatar_url": "https://avatars.githubusercontent.com/u/34902361?v=4",
+      "profile": "https://github.com/seanzhang98",
+      "contributions": [
+        "translation",
+        "code"
+      ]
     }
   ]
 }