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