Add word count to Twenty Seventeen entry meta section

echo '<div class="entry-meta">';
	if ( is_single() ) {
		twentyseventeen_posted_on();
	} else {
		echo twentyseventeen_time_link();
		twentyseventeen_edit_link();
	};
echo '<div id="word-count">This post contains ' . word_count() . ' words.</div>';
echo '</div><!-- .entry-meta -->';