old_contents: import React from 'react'
  import { Link } from 'react-router'
  
  const AboutView = () => (
    <div className='container text-center'>
      <h1>This is the about view!</h1>
      <hr />
      <Link to='/'>Back To Home View</Link>
    </div>
  )
  
  export default AboutView
  
new_contents: import React from 'react'
  import { Link } from 'react-router'
  
  export class AboutView extends React.Component {
    render () {
      return (
        <div className='container text-center'>
          <h1>This is the about view!</h1>
          <hr />
          <Link to='/'>Back To Home View</Link>
        </div>
      )
    }
  }
  
  export default AboutView
  
subject: switch to component class