fix frontmatter parse flag

src/frontmatter.ts

@@ -20,7 +20,7 @@ export function process_frontmatter(raw_document: string, parse = true) {
 
 	const formatter_yaml = raw_document.slice(3, end_index);
 	const document = raw_document.slice(end_index + 4);
-	const frontmatter = parse ? formatter_yaml : yaml.parse(formatter_yaml);
+	const frontmatter = parse ? yaml.parse(formatter_yaml) : formatter_yaml;
 
 	return { frontmatter, document };
 }