[meta] add auto-changelog

Author: ljharb

.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 -->
+
 1.1.9 / 2022-05-13
 =================
   * [Refactor] use `foreach` instead of `for-each`

package.json

@@ -23,13 +23,15 @@
 		"prepack": "npmignore --auto --commentLines=autogenerated",
 		"prepublishOnly": "safe-publish-latest",
 		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prelint": "evalmd README.md",
+		"lint": "eslint --ext=js,mjs .",
 		"pretest": "npm run --silent lint",
 		"test": "npm run tests-only && npm run test:harmony",
 		"tests-only": "nyc tape test",
 		"test:harmony": "nyc node --harmony --es-staging test",
 		"posttest": "npx aud --production",
-		"prelint": "evalmd README.md",
-		"lint": "eslint --ext=js,mjs ."
+		"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",
@@ -65,6 +67,7 @@
 	"devDependencies": {
 		"@ljharb/eslint-config": "^21.0.0",
 		"aud": "^2.0.1",
+		"auto-changelog": "^2.4.0",
 		"eslint": "=8.8.0",
 		"evalmd": "^0.0.19",
 		"in-publish": "^2.0.1",
@@ -98,6 +101,15 @@
 	"engines": {
 		"node": ">= 0.4"
 	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true,
+		"startingVersion": "1.1.10"
+	},
 	"publishConfig": {
 		"ignore": [
 			".github/workflows"