해시 기반 작성자 db에 추가

 const app = require('../server');
 const db = require('../db');
+const hash = require('../hash');
 
 app.get('/', async(req, res) => {
     res.render('boardlist', {boards: await db.get('board').find()});
@@ -23,5 +24,6 @@ app.post('/board/:bid', async(req, res) => {
         res.status(404).send('그런 판은 우리에게 있을 수 없어.');
     }
     let thread = await db.get('thread').insert({board: board._id, title: req.body.title, content: req.body.content, lastUpdated: Date.now(), count: 1});
+    await db.get('thread').update(thread._id, {$set: {writer: hash(thread._id, req.ip)}});
     res.redirect('/thread/' + thread._id);
 });