Update metadata

Author: wooorm

package.json

@@ -1,11 +1,17 @@
 {
   "name": "mdast-util-toc",
   "version": "5.0.1",
-  "description": "Generate a Table of Contents (TOC) from a given Markdown file",
+  "description": "mdast utility to generate a table of contents from a tree",
   "license": "MIT",
   "keywords": [
+    "unist",
     "mdast",
+    "mdast-util",
     "util",
+    "utility",
+    "markdown",
+    "table",
+    "contents",
     "toc"
   ],
   "repository": "syntax-tree/mdast-util-toc",