Bump morgan from 1.9.0 to 1.9.1

app.js

@@ -1,25 +1,24 @@
-var createError = require('http-errors');
-var express = require('express');
-var path = require('path');
-var cookieParser = require('cookie-parser');
-var logger = require('morgan');
+const createError = require('http-errors');
+const express = require('express');
+const path = require('path');
+const cookieParser = require('cookie-parser');
+const logger = require('morgan');
 
-var indexRouter = require('./routes/index');
-var usersRouter = require('./routes/users');
-var catalogRouter = require('./routes/catalog');  //Import routes for "catalog" area of site
+const indexRouter = require('./routes/index');
+const usersRouter = require('./routes/users');
+const catalogRouter = require('./routes/catalog');  //Import routes for "catalog" area of site
 
-var app = express();
+const app = express();
 
 //Import the mongoose module
-var mongoose = require('mongoose');
+const mongoose = require('mongoose');
 
 //Set up default mongoose connection
-var mongoDB = 'mongodb://127.0.0.1/local';
-mongoose.connect(mongoDB);
-// Get Mongoose to use the global promise library
-mongoose.Promise = global.Promise;
+const mongoDB = 'mongodb://127.0.0.1/local';
+mongoose.connect(mongoDB, { useNewUrlParser: true });
+
 //Get the default connection
-var db = mongoose.connection;
+const db = mongoose.connection;
 
 //Bind connection to error event (to get notification of connection errors)
 db.on('error', console.error.bind(console, 'MongoDB connection error:'));
@@ -41,9 +40,7 @@ app.use('/catalog', catalogRouter);  // Add catalog routes to middleware chain.
 
 // catch 404 and forward to error handler
 app.use(function (req, res, next) {
-	var err = new Error('Not Found');
-	err.status = 404;
-	next(err);
+	next(createError(404));
 });
 
 // error handler