message: docs: update changelog with 12.1.1 release
diff: +<a name="12.1.1"></a>
  +
  +# 12.1.1 (2021-09-30)
  +
  +### @nguniversal/builders
  +
  +| Commit | Type | Description |
  +| ------------------------------------------------------------------------------------------------ | ---- | -------------------------------------------- |
  +| [00cc596f](https://github.com/angular/universal/commit/00cc596fe83fb4f4206b00e6a21975862dfd60e5) | fix | index.original.html should be used if exists |
  +
  +## Special Thanks
  +
  +Doug Parker, Javier Infante and ikeq
  +
  <a name="12.1.0"></a>
  # 12.1.0 (2021-06-26)
  