Bump auto-changelog from 1.16.4 to 2.0.0

Bumps [auto-changelog](https://github.com/CookPete/auto-changelog) from 1.16.4 to 2.0.0.
- [Release notes](https://github.com/CookPete/auto-changelog/releases)
- [Changelog](https://github.com/CookPete/auto-changelog/blob/master/CHANGELOG.md)
- [Commits](https://github.com/CookPete/auto-changelog/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -18,7 +18,7 @@
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.9.0",
     "@babel/runtime": "^7.9.2",
-    "auto-changelog": "^1.16.4",
+    "auto-changelog": "^2.0.0",
     "babel-preset-gatsby-package": "^0.3.1",
     "cross-env": "^7.0.2",
     "eslint": "^6.8.0",