text: import React from 'react';
  
  
  export default React.createClass({
      propTypes: {
          name:            React.PropTypes.string.isRequired,
          changeAddressee: React.PropTypes.func.isRequired
      },
  
      render: function () {
          return (
            <div className="greeting">
              <h3>
                  Hiya, {this.props.name}!
              </h3>
              <button onClick={this.props.changeAddressee}>
                  Change Adressee
              </button>
            </div>
          );
      },
  });
  