<!-- Release notes generated using configuration in .github/release.yml at main -->
What's Changed
* Add option to force unions (and options) to be rendered with bars by hoodmane in https://github.com/tox-dev/sphinx-autodoc-typehints/pull/418 (on by default, hence major version bump)
**Full Changelog**: https://github.com/tox-dev/sphinx-autodoc-typehints/compare/1.25.3...2.0.0