build: changelog generation

Author: yyx990803

CHANGELOG.md

@@ -0,0 +1,3 @@
+# [3.0.0-alpha.0](https://github.com/vuejs/vue-next/compare/a8522cf48c09efbb2063f129cf1bea0dae09f10a...v3.0.0-alpha.0) (2019-12-20)
+
+For changes between 2.x and 3.0 up to this release, please refer to merged RFCs [here](https://github.com/vuejs/rfcs/pulls?q=is%3Apr+is%3Amerged+label%3A3.x).

package.json

@@ -13,7 +13,8 @@
     "lint": "prettier --write --parser typescript \"packages/**/*.ts?(x)\"",
     "test": "node scripts/build.js vue -f global -d && jest",
     "test-dts": "node scripts/build.js reactivity runtime-core runtime-dom -t -f esm && tsd",
-    "release": "node scripts/release.js"
+    "release": "node scripts/release.js",
+    "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s"
   },
   "types": "test-dts/index.d.ts",
   "tsd": {
@@ -41,6 +42,7 @@
     "@types/puppeteer": "^2.0.0",
     "brotli": "^1.3.2",
     "chalk": "^2.4.2",
+    "conventional-changelog-cli": "^2.0.31",
     "enquirer": "^2.3.2",
     "execa": "^2.0.4",
     "fs-extra": "^8.1.0",