message: Updated example with valid isRequired
diff: @@ -22,7 +22,7 @@ MyComponent.propTypes = {
  /**
  * Description of prop "foo".
  */
  - foo: PropTypes.number.isRequired,
  + foo: PropTypes.number,
  /**
  * Description of prop "bar" (a custom validation function).
  */
  @@ -32,7 +32,7 @@ MyComponent.propTypes = {
  baz: PropTypes.oneOfType([
  PropTypes.number,
  PropTypes.string
  - ]),
  + ]).isRequired,
  };
  MyComponent.defaultProps = {
  