Changed
- Remove dependency on pandas for `read_gudb` ([134](https://github.com/cbrnr/sleepecg/pull/134) by [Florian Hofer](https://github.com/hofaflo))
- Update SHHS encoding and missing data handling for `read_shhs` ([139](https://github.com/cbrnr/sleepecg/pull/139) by [Andrew Gilbert](https://github.com/adgilbert))
- Ignore expected warnings during feature extraction ([142](https://github.com/cbrnr/sleepecg/pull/142) by [Florian Hofer](https://github.com/hofaflo))