Feature Request: Switchable Defaults

[dara-rockwell]

Could be nice to have multiple defaults based upon a switch:

const environment = process.env.NODE_ENV || 'development';

export default autoConfig({
  host: {
    help: 'Host',
    args: ['--host', '-h', 'HOST'],
    default: {
        development: 'http://localhost:3001',
        production: 'http://api.production.com'
    },
    required: true
  }
}, {
  default: environment
} );