Add React Developent Tools to Electron project on development mode.

001_install-react-devtools.js

// If working in development mode, install React DevTools
if (process.env.NODE_ENV === 'development'){
  const {
    default: installExtension,
    REACT_DEVELOPER_TOOLS
  } = require('electron-devtools-installer')
  // Install chrome extensions
  installExtension(REACT_DEVELOPER_TOOLS)
    .then((name) => console.log(`Added Extension:  ${name}`))
    .catch((err) => console.log('An error occurred: ', err));
}