Merge pull request #50 from Konkuk-KUIT/turtlehwan

hotfix: id convert string for json-server id

Author: Turtle-Hwan

week3/jinho1011/todo/app.js

@@ -41,7 +41,7 @@ const addTodo = () => {
   if (!title) return;
 
   const newTodo = {
-    id: date.getTime(),
+    id: date.getTime().toString(),
     title,
     createdAt,
   };