code: func (s *AppsService) FindUserInstallation(ctx context.Context, user string) (*Installation, *Response, error) {
  	return s.getInstallation(ctx, fmt.Sprintf("users/%v/installation", user))
  }
docs: // FindUserInstallation finds the user's installation information.
  //
  // GitHub API docs: https://developer.github.com/v3/apps/#find-repository-installation