Dataspecs

What's Changed
* Prioritize optional attributes of objects by astropenguin in https://github.com/astropenguin/dataspecs/pull/34


**Full Changelog**: https://github.com/astropenguin/dataspecs/compare/v0.5.0...v0.6.0

What's Changed
* Refactor codes and tests by astropenguin in https://github.com/astropenguin/dataspecs/pull/31
* Make spec class generic by astropenguin in https://github.com/astropenguin/dataspecs/pull/32


**Full Changelog**: https://github.com/astropenguin/dataspecs/compare/v0.4.0...v0.5.0

What's Changed
* Add function to format data spec attributes by formatter specs by astropenguin in https://github.com/astropenguin/dataspecs/pull/28


**Full Changelog**: https://github.com/astropenguin/dataspecs/compare/v0.3.0...v0.4.0

**Full Changelog**: https://github.com/astropenguin/dataspecs/compare/v0.2.0...v0.3.0

**Full Changelog**: https://github.com/astropenguin/dataspecs/compare/v0.1.0...v0.2.0

What's Changed
* Add spec classes by astropenguin in https://github.com/astropenguin/dataspecs/pull/10
* Add api module by astropenguin in https://github.com/astropenguin/dataspecs/pull/12


**Full Changelog**: https://github.com/astropenguin/dataspecs/compare/v0.0.2...v0.1.0