style: 오타 수정 (#6)

routes/schedule.js

 const express = require('express');
 const router = express.Router();
-const { isLoggedIn } = require('../middlewares/auth');
+const { isLoggedIn } = require('../middleware/auth');
 const ScheduleController = require('../controllers/scheduleController');
 
 /**

services/scheduleService.js

 const { Op } = require('sequelize');
 const Schedule = require('../models/Schedule');
 
-class schedulService {
+class scheduleService {
 
     /**
      * transactin wrapper 함수