code: func (s *UsersService) GetHovercard(ctx context.Context, user string, opt *HovercardOptions) (*Hovercard, *Response, error) {
  	u := fmt.Sprintf("users/%v/hovercard", user)
  	u, err := addOptions(u, opt)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept header when this API fully launches.
  	req.Header.Set("Accept", mediaTypeHovercardPreview)
  
  	hc := new(Hovercard)
  	resp, err := s.client.Do(ctx, req, hc)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return hc, resp, nil
  }
docs: // GetHovercard fetches contextual information about user. It requires authentication
  // via Basic Auth or via OAuth with the repo scope.
  //
  // GitHub API docs: https://developer.github.com/v3/users/#get-contextual-information-about-a-user