private function options_sub_tabs() {
		$current_tab = isset( $_GET['subtab'] ) ? esc_attr( $_GET['subtab'] ) : 'github_updater';
		echo '<nav class="nav-tab-wrapper" aria-label="Tertiary menu">';
		foreach ( $this->settings_sub_tabs() as $key => $name ) {
			$active = ( $current_tab === $key ) ? 'nav-tab-active' : '';
			echo '<a class="nav-tab ' . $active . '" href="?page=github-updater&tab=github_updater_settings&subtab=' . $key . '">' . $name . '</a>';
		}
		echo '</nav>';
	}