A bug for optional unions was fixed, Thanks [soaxelbrooke](https://github.com/soaxelbrooke)!
python
serde
dataclass(frozen=True)
class Bar:
request: Optional[Union[str, int]]
* docs: add soaxelbrooke as a contributor ([063e705](https://github.com/yukinarit/pyserde/commit/063e705))
* Add support for optional unions ([075949b](https://github.com/yukinarit/pyserde/commit/075949b))
* Add typing-utils for compatibility with python ver < 3.8 ([620b9f6](https://github.com/yukinarit/pyserde/commit/620b9f6))
* Rely on compay.get_args instead of adding dependency ([d93f894](https://github.com/yukinarit/pyserde/commit/d93f894))