Add new text syntax

And some fixes

src/text/html.ts

@@ -54,6 +54,12 @@ const handlers = {
 		document.body.appendChild(blockquote);
 	},
 
+	title({ document }, { title }) {
+		const h1 = document.createElement('h1');
+		h1.textContent = title;
+		document.body.appendChild(h1);
+	},
+
 	text({ document }, { content }) {
 		for (const text of content.split('\n')) {
 			const node = document.createTextNode(text);

src/text/parse/elements/title.ts

@@ -0,0 +1,14 @@
+/**
+ * Title
+ */
+
+module.exports = text => {
+	const match = text.match(/^【(.+?)】\n/);
+	if (!match) return null;
+	const title = match[0];
+	return {
+		type: 'title',
+		content: title,
+		title: title.substr(1, title.length - 3)
+	};
+};

src/text/parse/index.ts

@@ -4,6 +4,7 @@
 
 const elements = [
 	require('./elements/bold'),
+	require('./elements/title'),
 	require('./elements/url'),
 	require('./elements/link'),
 	require('./elements/mention'),