CFF changes due to recent migration

Updated to EpRegistry Version 2024-03-14

v0.5.4 -> v0.5.4.1

Bugfix

Refactoring

Updated package versions, and adapted tests for new pandas version, u…

…pdated README.md

v0.5.0 -> v0.5.1 (bugfix)

v0.4.3 -> v0.5.0

v0.4.2 -> v0.4.3

v0.4.1 -> v0.4.2

v0.4.0 -> v0.4.1