Bump auto-changelog from 2.1.0 to 2.2.0

Bumps [auto-changelog](https://github.com/CookPete/auto-changelog) from 2.1.0 to 2.2.0.
- [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/compare/v2.1.0...v2.2.0)

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

package-lock.json

@@ -2419,9 +2419,9 @@
       "dev": true
     },
     "auto-changelog": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/auto-changelog/-/auto-changelog-2.1.0.tgz",
-      "integrity": "sha512-4Bwv4eyy5PUpYkeWX0XfoItbV2tKHNIzO473U+RMkj2hWXm1EtAeyZyFh2atccPqrhn/PBmhk3g9GLDxkltxXQ==",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/auto-changelog/-/auto-changelog-2.2.0.tgz",
+      "integrity": "sha512-RBY0hhVNXstggOQL0SyUaCfSiVD11CVXEHvDwB+mEt9UnhXPqhdpQ7nIVGDEog7JopTdYbydULLLt6v//qrWjw==",
       "dev": true,
       "requires": {
         "commander": "^5.0.0",