content: import React from 'react';
  import slackImg from '../../img/Slack.png';
  
  export default class Logout extends React.Component {
    render() {
      return (
        <div>
          <a className="btn btn-danger slack-button" onClick={() => this.props.logoutUser()}>
            <span className="sign-out">Sign Out</span> <img className="slack-image" src={slackImg} />
          </a>
        </div>
      );
    }
  }
  
  // Proptype Validation
  Logout.propTypes = {
    logoutUser: React.PropTypes.func
  };
  