What's Changed
* Add `msca.collections.UniqueSeq` class by zhengp0 in https://github.com/ihmeuw-msca/msca/pull/15
* Explicitly specify `dtype` in pre-conditioner linear operator by zhengp0 in https://github.com/ihmeuw-msca/msca/pull/16
**Full Changelog**: https://github.com/ihmeuw-msca/msca/compare/v0.2.0...v0.3.0