- Add typing. Thanks to [aecay](https://github.com/aecay) for the [PR #45](https://github.com/corenting/immutabledict/pull/45).
1.2.0
- Support [PEP 584 union operators](https://www.python.org/dev/peps/pep-0584/). Thanks to [lambdalisue](https://github.com/lambdalisue) for the [PR #34](https://github.com/corenting/immutabledict/pull/34).
1.1.0
- Add Python 3.9 to supported versions, remove Python 3.5 - Bump dev dependencies - Improve README