Change to require Node.js 16

Author: wooorm

readme.md

@@ -517,7 +517,7 @@ 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,
-`micromark-extension-gfm-footnote@^1`, compatible with Node.js 12.
+`micromark-extension-gfm-footnote@^2`, compatible with Node.js 16.
 
 This package works with `micromark` version `3` and later.
 

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/", "lib/", "node_modules/", "index.js"],
   "include": ["**/*.js", "dev/index.d.ts"]