Sleepecg

This release adds support for Python 3.12.

This release switches to [edfio ](https://edfio.readthedocs.io/en/stable/index.html)for loading EDF files.

This is a minor release, which only changes how imports are handled within the package. It contains no changes relevant for users.

This release removes an unnecessary `pandas` dependency, fixes issues with reading SHHS data, and gets rid of expected warnings during feature extraction.

This release adds a new function which plots ECG records together with (multiple) annotations. We also tweaked the Pan-Tompkins ECG detector to better handle flat data segments at the beginning of a recording. We also switched our documentation to MkDocs, which looks really nice! Finally, we fixed some minor issues and generally improved consistency of our functions – see our CHANGELOG.md for more details.

Include classifiers and tests.