title: Heroku cannot find module 'Sequelize'
body: <p>I'm getting the error heroku cannot find module 'Sequelize' when the server runs npm start on index.js file. When I run it locally by command heroku local it works fine. What I don't understand is that there is no module called 'Sequelize' in my project. It's called in lower case sequelize. Here's my package.json </p>
  
  <pre><code>{
    "name": "anonbay",
    "version": "1.0.0",
    "description": "social network app",
    "main": "index.js",
    "scripts": {
      "start": "node index.js"
    },
    "author": "saud",
    "license": "ISC",
    "dependencies": {
      "bcrypt-nodejs": "0.0.3",
      "body-parser": "^1.16.0",
      "express": "^4.14.0",
      "express-graphql": "^0.6.3",
      "express-session": "^1.15.3",
      "graphql": "^0.9.1",
      "graphql-subscriptions": "^0.3.1",
      "lodash": "^4.17.4",
      "mongoose": "^4.7.7",
      "pg": "^6.1.2",
      "pg-hstore": "^2.3.2",
      "sequelize": "^3.30.4",
      "subscriptions-transport-ws": "^0.6.0"
    }
  }
  </code></pre>