Change to require Node.js 16

Author: wooorm

readme.md

@@ -297,10 +297,10 @@ versions of Node.js.
 When we cut a new major release, we drop support for unmaintained versions of
 Node.
 This means we try to keep the current release line,
-`mdast-util-frontmatter@^1`, compatible with Node.js 12.
+`mdast-util-frontmatter@^2`, compatible with Node.js 16.
 
-This utility works with `mdast-util-from-markdown` version 1+ and
-`mdast-util-to-markdown` version 1+.
+This utility works with `mdast-util-from-markdown` version 2+ and
+`mdast-util-to-markdown` version 2+.
 
 ## Related
 

tsconfig.json

@@ -5,10 +5,10 @@
     "declaration": true,
     "emitDeclarationOnly": true,
     "exactOptionalPropertyTypes": true,
-    "lib": ["es2020"],
+    "lib": ["es2022"],
     "module": "node16",
     "strict": true,
-    "target": "es2020"
+    "target": "es2022"
   },
   "exclude": ["coverage/", "node_modules/"],
   "include": ["**/*.js", "test-types.d.ts"]