add newline after rendered headers

src/renderer.ts

@@ -37,7 +37,7 @@ function heading(renderer: marked.Renderer, opts: MarkdownOptions) {
 				+ `\n\t</a>`;
 		}
 
-		return `\n<h${level} ${html_attrs.join(' ')}>\n\t${text}\n</h${level}>`;
+		return `\n<h${level} ${html_attrs.join(' ')}>\n\t${text}\n</h${level}>\n`;
 	};
 }