[meta] add auto-changelog

.npmrc

@@ -1 +1,3 @@
 package-lock=false
+allow-same-version=true
+message=v%s

CHANGELOG.md

@@ -1,3 +1,12 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+<!-- auto-changelog-above -->
+
 # 2.2.1
  - [Deps] update `define-properties`, `es-abstract`
  - [meta] use `npmignore` to autogenerate an npmignore file

package.json

@@ -18,7 +18,9 @@
 		"pretest": "npm run lint",
 		"tests-only": "nyc tape 'test/**/*.js'",
 		"test": "npm run tests-only",
-		"posttest": "aud --production"
+		"posttest": "aud --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
 	},
 	"repository": {
 		"type": "git",
@@ -33,6 +35,7 @@
 		"@es-shims/api": "^2.4.2",
 		"@ljharb/eslint-config": "^21.1.0",
 		"aud": "^2.0.3",
+		"auto-changelog": "^2.4.0",
 		"eslint": "=8.8.0",
 		"functions-have-names": "^1.2.3",
 		"has-strict-mode": "^1.0.1",
@@ -48,6 +51,15 @@
 		"es-abstract": "^1.22.1",
 		"es-shim-unscopables": "^1.0.0"
 	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true,
+		"startingVersion": "2.2.2"
+	},
 	"publishConfig": {
 		"ignore": [
 			".github/workflows"