fixed Heroku deploy issue and updated to es6 module

Author: lgope

config.env.example

@@ -1,25 +1,25 @@
 // Must be your keys
 
+NODE_ENV=
 PORT=
-
 DATABASE=
-DATABASE_PASSWORD=
 DATABASE_LOCAL=
+DATABASE_PASSWORD=
+
+
+JWT_SECRET=
+JWT_EXPIRES_IN=
+JWT_COOKIE_EXPIRES_IN=
 
-EMAIL_FROM=
 EMAIL_USERNAME=
 EMAIL_PASSWORD=
 EMAIL_HOST=
 EMAIL_PORT=
 
-JWT_COOKIE_EXPIRES_IN=
-JWT_EXPIRES_IN=
-JWT_SECRET=
-
-NODE_ENV=
+EMAIL_FROM=
 
-SENDGRID_PASSWORD=
 SENDGRID_USERNAME=
+SENDGRID_PASSWORD=
 
 STRIPE_SECRET_KEY=
 STRIPE_WEBHOOK_SECRET=

package.json

@@ -1,9 +1,12 @@
 {
   "name": "node-natours",
   "version": "1.0.0",
+  "author": "Lakshman Gope",
   "description": "A mockup landing page for a travel agency startup.",
   "main": "app.js",
   "type": "module",
+  "license": "ISC",
+  "homepage": "https://github.com/lgope/Natours#readme",
   "scripts": {
     "start": "node server.js",
     "dev": "nodemon server.js",
@@ -16,12 +19,9 @@
     "type": "git",
     "url": "git+https://github.com/lgope/Natours.git"
   },
-  "author": "Lakshman Gope",
-  "license": "ISC",
   "bugs": {
     "url": "https://github.com/lgope/Natours/issues"
   },
-  "homepage": "https://github.com/lgope/Natours#readme",
   "dependencies": {
     "@babel/polyfill": "^7.7.0",
     "a": "^3.0.1",
@@ -67,4 +67,4 @@
   "engines": {
     "node": "^10"
   }
-}
+}