title: How to change electron-forge default port?
body: <p>I can't find reference about this anywhere in their website/docs. I need to change this to another port, currently it's stuck in 3000.</p>
  
  <p>Here's how I create an electron project with <code>electron-forge</code></p>
  
  <pre><code>yarn create electron-app my-new-app --template=typescript
  </code></pre>
  
  <p>and whenever there is another service in port 3000. It throws an error:</p>
  
  <pre><code>listen EADDRINUSE :::3000
  Error: listen EADDRINUSE :::3000
      at Server.setupListenHandle [as _listen2] (net.js:1360:14)
  </code></pre>
  
  <p>my <code>webpack.main.config.js</code> file:</p>
  
  <pre><code>const path = require('path');
  module.exports = {
    entry: './src/index.ts',
    // Put your normal webpack config below here
    module: {
      rules: require('./webpack.rules')
    },
    resolve: {
      extensions: ['.js', '.ts', '.jsx', '.tsx', '.css', '.json']
    },
    devServer: {
      contentBase: path.join(__dirname, 'dist'),
      compress: true,
      port: 9000
    }
  };
  </code></pre>