What's Changed
* Fix notebook example errors by trhallam in https://github.com/trhallam/segysak/pull/114
* Update GitHub actions by trhallam in https://github.com/trhallam/segysak/pull/115
* Fix text header creation by trhallam in https://github.com/trhallam/segysak/pull/116
**Full Changelog**: https://github.com/trhallam/segysak/commits/v0.4rc1