fix mongo uri

server.js

@@ -6,7 +6,7 @@ const mongoose = require('mongoose')
 require('dotenv').config()
 const app = express()
 const PORT = process.env.PORT
-const MONGODB_URI = process.env.MONGODB_URI + '/merncrud'
+const MONGODB_URI = process.env.MONGODB_URI
 
 const whitelist = ['http://localhost:3000', 'https://fathomless-sierra-68956.herokuapp.com']
 const corsOptions = {
@@ -21,7 +21,7 @@ const corsOptions = {
 
 // middleware
 app.use(express.json()) // use .json(), not .urlencoded()
-app.use(cors())
+app.use(cors(corsOptions))
 
 // Error / Disconnection
 mongoose.connection.on('error', err => console.log(err.message + ' is Mongod not running?'))