content: import React from 'react'
  import PropTypes from 'prop-types'
  
  import Login from './Login'
  
  const LoginScreen = () => <Login />
  
  LoginScreen.navigationOptions = () => ({
      header: null,
  })
  
  LoginScreen.propTypes = {
      navigation: PropTypes.object.isRequired,
  }
  
  export default LoginScreen;