Adding auto-changelog generation

I'd like to be able to use Lerna's built in changelog functionality for
this, but it requires us using a very specific commit message format
which i'm not sure would have too much buy in at this time.

This is better than nothing for now

package.json

@@ -8,7 +8,8 @@
     "build": "./build.sh & lerna run build",
     "watch": "lerna run watch --stream",
     "deploy": "gh-pages --dotfiles -d example/dist",
-    "publish": "lerna publish"
+    "publish": "lerna publish",
+    "version": "auto-changelog -v $(node -e \"console.log(require('./lerna.json').version)\") && git add CHANGELOG.md"
   },
   "publishConfig": {
     "registry": "http://registry.npmjs.org"
@@ -23,6 +24,7 @@
     "@babel/core": "^7.0.0-beta.55",
     "@babel/preset-env": "^7.0.0-beta.55",
     "@babel/preset-react": "^7.0.0-beta.55",
+    "auto-changelog": "^1.10.2",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^23.4.2",
     "babel-loader": "^8.0.0-beta.4",