updated marked to v5; better baseurl handling

src/base-url.ts

@@ -0,0 +1,11 @@
+
+import { marked } from 'marked';
+import { MarkdownOptions } from './render';
+
+export function base_url_walk_tokens(token: marked.Token, options: MarkdownOptions) {
+	if (options.base_url) {
+		if (token.type === 'link' || token.type === 'image') {
+			token.href = (new URL(token.href, options.base_url)).toString();
+		}
+	}
+}