Add more extensions

Author: wooorm

readme.md

@@ -162,10 +162,16 @@ Take a look at [`lib/handle`][handlers] for examples.
 
 *   [`syntax-tree/mdast-util-frontmatter`](https://github.com/syntax-tree/mdast-util-frontmatter)
     — parse frontmatter (YAML, TOML, more)
+*   [`syntax-tree/mdast-util-gfm`](https://github.com/syntax-tree/mdast-util-gfm)
+    — parse GFM
 *   [`syntax-tree/mdast-util-gfm-autolink-literal`](https://github.com/syntax-tree/mdast-util-gfm-autolink-literal)
     — parse GFM autolink literals
 *   [`syntax-tree/mdast-util-gfm-strikethrough`](https://github.com/syntax-tree/mdast-util-gfm-strikethrough)
     — parse GFM strikethrough
+*   [`syntax-tree/mdast-util-gfm-table`](https://github.com/syntax-tree/mdast-util-gfm-table)
+    — parse GFM tables
+*   [`syntax-tree/mdast-util-gfm-task-list-item`](https://github.com/syntax-tree/mdast-util-gfm-task-list-item)
+    — parse GFM task list items
 
 ## Security